示例#1
0
文件: model.py 项目: SCECcode/UCVM
    def vpvs_ratio_test(_: unittest.TestCase):

        granularity = 0.001
        depth_spacing = 10000

        counter = 0
        sd_array = UCVM.create_max_seismicdata_array()

        for x_val in \
                custom_range(float(target.corners["bl"]["e"]),
                             float(target.corners["tr"]["e"]) + granularity,
                             granularity):
            for y_val in \
                    custom_range(float(target.corners["bl"]["n"]),
                                 float(target.corners["tr"]["n"]) + granularity,
                                 granularity):
                for z_val in custom_range(0, target.max_depth + depth_spacing, depth_spacing):
                    sd_array[counter].original_point = Point(x_val, y_val, z_val)
                    sd_array[counter].converted_point = Point(x_val, y_val, z_val)

                    if counter == len(sd_array) - 1:
                        UCVM.query(sd_array, name, ["velocity"])
                        _test_vpvs_ratio(sd_array)
                        counter = 0
                    else:
                        counter += 1

        _test_vpvs_ratio(sd_array[0:counter])
示例#2
0
def mesh_extract_single(information: dict, slices: str=None, interval: str=None, **kwargs) -> bool:
    """
    Given a dictionary containing the relevant parameters for the extraction, extract the material
    properties for a single process.

    Args:
        information (dict): The dictionary containing the metadata defining the extraction.

    Returns:
        True, when successful. It will raise an error if the extraction is not successful.
    """
    internal_mesh = InternalMesh(information)

    if slices is not None:
        internal_mesh.do_slices(slices)
    elif interval is not None:
        internal_mesh.do_interval(interval)

    sd_array = UCVM.create_max_seismicdata_array(min(internal_mesh.total_size, 250000), 1)

    print("\nThere are a total of " + humanize.intcomma(internal_mesh.total_size) + " grid points "
          "to extract.\nWe can extract " + humanize.intcomma(len(sd_array)) + " points at once.\n"
          "\nStarting extraction...\n")

    information["minimums"]["vp"] = float(information["minimums"]["vp"])
    information["minimums"]["vs"] = float(information["minimums"]["vs"])

    if internal_mesh.format == "awp":
        _mesh_extract_single_awp(sd_array, information, internal_mesh, slices, interval)
    elif internal_mesh.format == "rwg":
        _mesh_extract_single_rwg(sd_array, information, internal_mesh)

    print("\nExtraction done.")

    return True
示例#3
0
    def vpvs_ratio_test(_: unittest.TestCase):

        granularity = 0.001
        depth_spacing = 10000

        counter = 0
        sd_array = UCVM.create_max_seismicdata_array()

        for x_val in \
                custom_range(float(target.corners["bl"]["e"]),
                             float(target.corners["tr"]["e"]) + granularity,
                             granularity):
            for y_val in \
                    custom_range(float(target.corners["bl"]["n"]),
                                 float(target.corners["tr"]["n"]) + granularity,
                                 granularity):
                for z_val in custom_range(0, target.max_depth + depth_spacing,
                                          depth_spacing):
                    sd_array[counter].original_point = Point(
                        x_val, y_val, z_val)
                    sd_array[counter].converted_point = Point(
                        x_val, y_val, z_val)

                    if counter == len(sd_array) - 1:
                        UCVM.query(sd_array, name, ["velocity"])
                        _test_vpvs_ratio(sd_array)
                        counter = 0
                    else:
                        counter += 1

        _test_vpvs_ratio(sd_array[0:counter])
示例#4
0
    def extract(self):
        num_points = int(math.ceil((self.profile_properties.depth - self.profile_point.z_value) /
                                   self.profile_properties.spacing)) + 1
        self.sd_array = UCVM.create_max_seismicdata_array(num_points)

        for i in range(0, num_points):
            self.sd_array[i].original_point.x_value = self.profile_point.x_value
            self.sd_array[i].original_point.y_value = self.profile_point.y_value
            if self.profile_point.depth_elev == UCVM_DEPTH:
                self.sd_array[i].original_point.z_value = \
                    self.profile_point.z_value + (i * self.profile_properties.spacing)
            else:
                self.sd_array[i].original_point.depth_elev = UCVM_ELEVATION
                self.sd_array[i].original_point.z_value = \
                    self.profile_point.z_value - (i * self.profile_properties.spacing)

        UCVM.query(self.sd_array, self.cvms)
示例#5
0
文件: etree.py 项目: SCECcode/UCVM
def etree_extract_mpi(information: dict, rows: str=None, interval: str=None) -> bool:
    from mpi4py import MPI

    comm = MPI.COMM_WORLD
    rank = comm.Get_rank()
    size = comm.Get_size()

    stats = _calculate_etree_stats(
        information, int(information["properties"]["columns"]), int(information["properties"]["rows"])
    )

    start_rc = [1, 1]
    end_rc = [int(information["properties"]["rows"]), int(information["properties"]["columns"])]

    if rows is not None:
        if "-" in rows:
            parts = rows.split("-")
            start_rc = [int(parts[0]), 1]
            end_rc = [int(parts[1]), int(information["properties"]["columns"])]
        else:
            start_rc = [int(rows), 1]
            end_rc = [int(rows), int(information["properties"]["columns"])]
    elif interval is not None:
        if "-" in interval:
            parts = interval.split("-")
            parts1 = parts[0].split(",")
            start_rc = [int(parts1[0]), int(parts1[1])]
            parts2 = parts[1].split(",")
            end_rc = [int(parts2[0]), int(parts2[1])]
        else:
            interval = interval.split(",")
            start_rc = [int(interval[0]), int(interval[1])]
            end_rc = [int(interval[0]), int(interval[1])]

    if rank == 0:
        schema = "float Vp; float Vs; float density;".encode("ASCII")
        path = (os.path.join(information["out_dir"], information["etree_name"] + ".e")).encode("ASCII")

        if sys.byteorder == "little" and sys.platform != "darwin":
            if start_rc[0] == 1 and start_rc[1] == 1:
                ep = UCVMCCommon.c_etree_open(path, 578)
            else:
                ep = UCVMCCommon.c_etree_open(path, 2)
        else:
            if start_rc[0] == 1 and start_rc[1] == 1:
                ep = UCVMCCommon.c_etree_open(path, 1538)
            else:
                ep = UCVMCCommon.c_etree_open(path, 2)

        UCVMCCommon.c_etree_registerschema(ep, schema)

        rcs_to_extract = []

        current_rc = start_rc
        while not (current_rc[0] == end_rc[0] and current_rc[1] == end_rc[1] + 1):
            if current_rc[1] > int(information["properties"]["columns"]):
                current_rc[0] += 1
                current_rc[1] = 1
            rcs_to_extract.append((current_rc[0], current_rc[1]))
            current_rc[1] += 1

        total_extracted = 0
        is_done = [False for _ in range(size - 1)]

        while True:
            data = comm.recv(source=MPI.ANY_SOURCE)

            if data["code"] == "start":
                if len(rcs_to_extract) > 0:
                    comm.send(rcs_to_extract.pop(0), dest=data["source"])
                else:
                    comm.send("done", dest=data["source"])
                    is_done[data["source"] - 1] = True
            elif data["code"] == "write":
                print("[Node %d] Writing data from node %d to file." % (rank, data["source"]), flush=True)
                _etree_writer(ep, data["data"][0], data["data"][1], data["data"][2])
                total_extracted += data["data"][2]
                print("[Node %d] Data written successfully!" % rank, flush=True)
            elif data["code"] == "new":
                if len(rcs_to_extract) > 0:
                    comm.send(rcs_to_extract.pop(0), dest=data["source"])
                else:
                    comm.send("done", dest=data["source"])
                    is_done[data["source"] - 1] = True
                print("[Node %d] Writing data from node %d to file." % (rank, data["source"]), flush=True)
                _etree_writer(ep, data["data"][0], data["data"][1], data["data"][2])
                total_extracted += data["data"][2]
                print("[Node %d] Data written successfully!" % rank, flush=True)

            if False not in is_done:
                break

        metadata_string = ("Title:%s Author:%s Date:%s %u %s %f %f %f %f %f %f %u %u %u" % (
            str(information["author"]["title"]).replace(" ", "_"),
            str(information["author"]["person"]).replace(" ", "_"),
            str(information["author"]["date"]).replace(" ", "_"), 3, "Vp(float);Vs(float);density(float)",
            float(information["corners"]["bl"]["y"]), float(information["corners"]["bl"]["x"]),
            float(information["dimensions"]["x"]), float(information["dimensions"]["y"]),
            0, float(information["dimensions"]["z"]), int(stats["max_ticks"]["width"]),
            int(stats["max_ticks"]["height"]), int(stats["max_ticks"]["depth"])
        )).encode("ASCII")

        print("[Node %d] Total number of octants extracted: %d." % (rank, total_extracted), flush=True)

        UCVMCCommon.c_etree_setappmeta(ep, metadata_string)

        UCVMCCommon.c_etree_close(ep)
    else:
        done = False
        print("[Node %d] Maximum points per section is %d." % (rank, stats["max_points"]), flush=True)
        sd_array = UCVM.create_max_seismicdata_array(stats["max_points"], 1)
        count = 0

        comm.send({"source": rank, "data": "", "code": "start"}, dest=0)

        while not done:
            row_col = comm.recv(source=0)

            if row_col == "done":
                break

            print("[Node %d] Received instruction to extract column (%d, %d)." % (rank, row_col[0], row_col[1]),
                  flush=True)
            data = _extract_mpi(rank, sd_array, information, stats, row_col[1] - 1, row_col[0] - 1)
            count += data[2]
            print("[Node %d] Finished extracting column (%d, %d)" % (rank, row_col[0], row_col[1]))
            comm.send({"source": rank, "data": data, "code": "new"}, dest=0)

        print("[Node %d] Finished extracting %d octants." % (rank, count), flush=True)

    return True
示例#6
0
文件: etree.py 项目: SCECcode/UCVM
def etree_extract_single(information: dict, rows: str=None, interval: str=None) -> bool:
    schema = "float Vp; float Vs; float density;".encode("ASCII")
    path = (os.path.join(information["out_dir"], information["etree_name"] + ".e")).encode("ASCII")

    start_rc = [1, 1]
    end_rc = [int(information["properties"]["rows"]), int(information["properties"]["columns"])]

    if rows is not None:
        if "-" in rows:
            parts = rows.split("-")
            start_rc = [int(parts[0]), 1]
            end_rc = [int(parts[1]), int(information["properties"]["columns"])]
        else:
            start_rc = [int(rows), 1]
            end_rc = [int(rows), int(information["properties"]["columns"])]
    elif interval is not None:
        if "-" in interval:
            parts = interval.split("-")
            parts1 = parts[0].split(",")
            start_rc = [int(parts1[0]), int(parts1[1])]
            parts2 = parts[1].split(",")
            end_rc = [int(parts2[0]), int(parts2[1])]
        else:
            interval = interval.split(",")
            start_rc = [int(interval[0]), int(interval[1])]
            end_rc = [int(interval[0]), int(interval[1])]

    if sys.byteorder == "little" and sys.platform != "darwin":
        if start_rc[0] == 1 and start_rc[1] == 1:
            ep = UCVMCCommon.c_etree_open(path, 578)
        else:
            ep = UCVMCCommon.c_etree_open(path, 2)
    else:
        if start_rc[0] == 1 and start_rc[1] == 1:
            ep = UCVMCCommon.c_etree_open(path, 1538)
        else:
            ep = UCVMCCommon.c_etree_open(path, 2)

    UCVMCCommon.c_etree_registerschema(ep, schema)

    octant_count = 0

    stats = _calculate_etree_stats(
        information, int(information["properties"]["columns"]), int(information["properties"]["rows"])
    )

    sd_array = UCVM.create_max_seismicdata_array(stats["max_points"], 1)

    print("Maximum points per section is %d" % stats["max_points"])

    current_rc = start_rc

    while not (current_rc[0] == end_rc[0] and current_rc[1] == end_rc[1] + 1):
        if current_rc[1] > int(information["properties"]["columns"]):
            current_rc[0] += 1
            current_rc[1] = 1

        count = _extract_single(ep, sd_array, information, stats, current_rc[1] - 1, current_rc[0] - 1)

        if count is not None:
            octant_count += count
        else:
            raise Exception("HELP!")

        current_rc[1] += 1

    print(str(octant_count) + " octants were extracted.")

    metadata_string = ("Title:%s Author:%s Date:%s %u %s %f %f %f %f %f %f %u %u %u" % (
        str(information["author"]["title"]).replace(" ", "_"), str(information["author"]["person"]).replace(" ", "_"),
        str(information["author"]["date"]).replace(" ", "_"), 3, "Vp(float);Vs(float);density(float)",
        float(information["corners"]["bl"]["y"]), float(information["corners"]["bl"]["x"]),
        float(information["dimensions"]["x"]), float(information["dimensions"]["y"]),
        0, float(information["dimensions"]["z"]), int(stats["max_ticks"]["width"]),
        int(stats["max_ticks"]["height"]), int(stats["max_ticks"]["depth"])
    )).encode("ASCII")

    UCVMCCommon.c_etree_setappmeta(ep, metadata_string)

    UCVMCCommon.c_etree_close(ep)

    return True
    def plot(self, basic: bool = False):
        if self.needs_extraction:
            self.extract()
        else:
            # Read in the already extracted data.
            with open(self.extras["save_file"], "rb") as fd:
                self.extracted_data = np.load(fd)

        init_array = UCVM.create_max_seismicdata_array(self.QUERY_AT_ONCE, 1)

        lons = np.zeros(self.slice_properties.num_x *
                        self.slice_properties.num_y,
                        dtype=float).reshape(self.slice_properties.num_y,
                                             self.slice_properties.num_x)
        lats = np.zeros(self.slice_properties.num_x *
                        self.slice_properties.num_y,
                        dtype=float).reshape(self.slice_properties.num_y,
                                             self.slice_properties.num_x)
        data = np.zeros(self.slice_properties.num_x *
                        self.slice_properties.num_y,
                        dtype=float).reshape(self.slice_properties.num_y,
                                             self.slice_properties.num_x)
        topography = None

        if "features" in self.extras["plot"] and \
           "topography" in self.extras["plot"]["features"] and \
           str(self.extras["plot"]["features"]["topography"]).lower().strip() == "yes":
            topography = np.zeros(
                self.slice_properties.num_x * self.slice_properties.num_y,
                dtype="<f8").reshape(self.slice_properties.num_y,
                                     self.slice_properties.num_x)

        if str(self.extras["plot"]["property"]).lower().strip() == "vp":
            position = 0
            self.bounds = [
                0, 0.35, 0.70, 1.00, 1.35, 1.70, 2.55, 3.40, 4.25, 5.10, 5.95,
                6.80, 7.65, 8.50
            ]
            self.ticks = [
                0, 0.85, 1.70, 2.55, 3.40, 4.25, 5.10, 5.95, 6.80, 7.65, 8.50
            ]
            self.plot_cbar_label = "Vp (km/s)"
        elif str(self.extras["plot"]["property"]).lower().strip() == "vs":
            position = 1
            self.bounds = [
                0, 0.20, 0.40, 0.60, 0.80, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50,
                4.00, 4.50, 5.00
            ]
            self.ticks = [
                0, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00
            ]
            self.plot_cbar_label = "Vs (km/s)"
        elif str(self.extras["plot"]["property"]).lower().strip() == "density":
            position = 2
            self.bounds = [
                0, 0.20, 0.40, 0.60, 0.80, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50,
                4.00, 4.50, 5.00
            ]
            self.ticks = [
                0, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00
            ]
            self.plot_cbar_label = "Density (kg/m^3)"
        elif str(self.extras["plot"]["property"]).lower().strip() == "qp":
            position = 3
        elif str(self.extras["plot"]["property"]).lower().strip() == "qs":
            position = 4
        elif str(self.extras["plot"]
                 ["property"]).lower().strip() == "elevation":
            position = 0
            self.bounds = [-4, -3, -2, -1, 0, 1, 2, 3, 4]
            self.ticks = [-4, -3, -2, -1, 0, 1, 2, 3, 4]
            self.plot_cbar_label = "Elevation (km)"
        elif str(self.extras["plot"]["property"]).lower().strip() == "vs30":
            position = 0
            self.bounds = [
                0, 0.20, 0.40, 0.60, 0.80, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50,
                4.00, 4.50, 5.00
            ]
            self.ticks = [
                0, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00
            ]
            self.plot_cbar_label = "Vs (km/s)"
        elif str(self.extras["plot"]["property"]).lower().strip() == "z10":
            position = 0
            self.bounds = [
                0, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00
            ]
            self.ticks = self.bounds
            self.plot_cbar_label = "Depth (km)"
        elif str(self.extras["plot"]["property"]).lower().strip() == "z25":
            position = 1
            self.bounds = [
                0, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00
            ]
            self.ticks = self.bounds
            self.plot_cbar_label = "Depth (km)"
        else:
            position = 0

        im = InternalMesh.from_parameters(
            self.origin, {
                "num_x": self.slice_properties.num_x,
                "num_y": self.slice_properties.num_y,
                "num_z": 1,
                "rotation": self.slice_properties.rotation,
                "spacing": self.slice_properties.spacing,
                "projection": self.origin.projection
            }, self.cvms, "")
        im_iterator = AWPInternalMeshIterator(im, 0, im.total_size,
                                              len(init_array), init_array)

        num_queried = next(im_iterator)
        i = 0
        j = 0
        while num_queried > 0:
            for datum in init_array[0:num_queried]:
                new_pt = datum.original_point.convert_to_projection(
                    UCVM_DEFAULT_PROJECTION)
                lons[j][i] = new_pt.x_value
                lats[j][i] = new_pt.y_value

                if str(self.extras["plot"]["property"]).lower().strip() == "elevation" or \
                   str(self.extras["plot"]["property"]).lower().strip() == "vs30":
                    data[j][i] = self.extracted_data[
                        j * self.slice_properties.num_x + i] / 1000
                elif str(self.extras["plot"]["property"]).lower().strip() == "z10" or \
                     str(self.extras["plot"]["property"]).lower().strip() == "z25":
                    data[j][i] = self.extracted_data[(
                        (j * self.slice_properties.num_x) + i) * 2 +
                                                     position] / 1000
                else:
                    data[j][i] = self.extracted_data[(
                        (j * self.slice_properties.num_x) + i) * 6 +
                                                     position] / 1000
                    if topography is not None:
                        topography[j][i] = self.extracted_data[(
                            (j * self.slice_properties.num_x) + i) * 6 +
                                                               5] / 1000

                i += 1
                if i == self.slice_properties.num_x:
                    i = 0
                    j += 1

            try:
                num_queried = next(im_iterator)
            except StopIteration:
                break

        # Ok, now that we have the 2D array of lons, lats, and data, let's call on our inherited
        # classes show_plot function to actually show the plot.
        return super(HorizontalSlice, self).show_plot(lons,
                                                      lats,
                                                      data,
                                                      True,
                                                      topography=topography,
                                                      basic=basic)
示例#8
0
    def plot(self, prop: str = "vp", basic: bool = False):

        init_array = UCVM.create_max_seismicdata_array(
            self.dataset1.slice_properties.num_x *
            self.dataset1.slice_properties.num_y, 1)

        lons = np.zeros(self.dataset1.slice_properties.num_x *
                        self.dataset1.slice_properties.num_y,
                        dtype=float).reshape(
                            self.dataset1.slice_properties.num_y,
                            self.dataset1.slice_properties.num_x)
        lats = np.zeros(self.dataset1.slice_properties.num_x *
                        self.dataset1.slice_properties.num_y,
                        dtype=float).reshape(
                            self.dataset1.slice_properties.num_y,
                            self.dataset1.slice_properties.num_x)
        data = np.zeros(self.dataset1.slice_properties.num_x *
                        self.dataset1.slice_properties.num_y,
                        dtype=float).reshape(
                            self.dataset1.slice_properties.num_y,
                            self.dataset1.slice_properties.num_x)

        self.bounds = [-20, -15, -10, -5, 0, 5, 10, 15, 20]
        self.ticks = self.bounds
        self.plot_cbar_label = "Percentage difference."

        if str(prop).lower().strip() == "vp":
            position = 0
        elif str(prop).lower().strip() == "vs":
            position = 1
        elif str(prop).lower().strip() == "density":
            position = 2
        elif str(prop).lower().strip() == "qp":
            position = 3
        elif str(prop).lower().strip() == "qs":
            position = 4
        elif str(prop).lower().strip() == "elevation":
            position = 0
        elif str(prop).lower().strip() == "vs30":
            position = 0
        else:
            position = 0

        im = InternalMesh.from_parameters(
            self.dataset1.origin, {
                "num_x": self.dataset1.slice_properties.num_x,
                "num_y": self.dataset1.slice_properties.num_y,
                "num_z": 1,
                "rotation": self.dataset1.slice_properties.rotation,
                "spacing": self.dataset1.slice_properties.spacing,
                "projection": self.dataset1.origin.projection
            }, self.dataset1.cvms, "")
        im_iterator = AWPInternalMeshIterator(im, 0, im.total_size,
                                              len(init_array), init_array)

        num_queried = next(im_iterator)
        i = 0
        j = 0
        while num_queried > 0:
            for datum in init_array[0:num_queried]:
                new_pt = datum.original_point.convert_to_projection(
                    UCVM_DEFAULT_PROJECTION)
                lons[j][i] = new_pt.x_value
                lats[j][i] = new_pt.y_value

                data[j][i] = self.extracted_data[
                    (j * self.dataset1.slice_properties.num_x + i) * 6 +
                    position]

                i += 1
                if i == self.dataset1.slice_properties.num_x:
                    i = 0
                    j += 1

            try:
                num_queried = next(im_iterator)
            except StopIteration:
                break

        # Ok, now that we have the 2D array of lons, lats, and data, let's call on our inherited
        # classes show_plot function to actually show the plot.
        return super(Difference, self).show_plot(lons,
                                                 lats,
                                                 data,
                                                 True,
                                                 basic=basic)
示例#9
0
    def plot(self, prop: str="vp", basic: bool=False):

        init_array = UCVM.create_max_seismicdata_array(self.dataset1.slice_properties.num_x *
                                                       self.dataset1.slice_properties.num_y, 1)

        lons = np.zeros(self.dataset1.slice_properties.num_x * self.dataset1.slice_properties.num_y,
                        dtype=float).reshape(self.dataset1.slice_properties.num_y,
                                             self.dataset1.slice_properties.num_x)
        lats = np.zeros(self.dataset1.slice_properties.num_x * self.dataset1.slice_properties.num_y,
                        dtype=float).reshape(self.dataset1.slice_properties.num_y,
                                             self.dataset1.slice_properties.num_x)
        data = np.zeros(self.dataset1.slice_properties.num_x * self.dataset1.slice_properties.num_y,
                        dtype=float).reshape(self.dataset1.slice_properties.num_y,
                                             self.dataset1.slice_properties.num_x)

        self.bounds = [-20, -15, -10, -5, 0, 5, 10, 15, 20]
        self.ticks = self.bounds
        self.plot_cbar_label = "Percentage difference."

        if str(prop).lower().strip() == "vp":
            position = 0
        elif str(prop).lower().strip() == "vs":
            position = 1
        elif str(prop).lower().strip() == "density":
            position = 2
        elif str(prop).lower().strip() == "qp":
            position = 3
        elif str(prop).lower().strip() == "qs":
            position = 4
        elif str(prop).lower().strip() == "elevation":
            position = 0
        elif str(prop).lower().strip() == "vs30":
            position = 0
        else:
            position = 0

        im = InternalMesh.from_parameters(
            self.dataset1.origin,
            {
                "num_x": self.dataset1.slice_properties.num_x,
                "num_y": self.dataset1.slice_properties.num_y,
                "num_z": 1,
                "rotation": self.dataset1.slice_properties.rotation,
                "spacing": self.dataset1.slice_properties.spacing,
                "projection": self.dataset1.origin.projection
            },
            self.dataset1.cvms,
            ""
        )
        im_iterator = AWPInternalMeshIterator(im, 0, im.total_size, len(init_array), init_array)

        num_queried = next(im_iterator)
        i = 0
        j = 0
        while num_queried > 0:
            for datum in init_array[0:num_queried]:
                new_pt = datum.original_point.convert_to_projection(UCVM_DEFAULT_PROJECTION)
                lons[j][i] = new_pt.x_value
                lats[j][i] = new_pt.y_value

                data[j][i] = self.extracted_data[(j * self.dataset1.slice_properties.num_x + i) * 6 + position]

                i += 1
                if i == self.dataset1.slice_properties.num_x:
                    i = 0
                    j += 1

            try:
                num_queried = next(im_iterator)
            except StopIteration:
                break

        # Ok, now that we have the 2D array of lons, lats, and data, let's call on our inherited
        # classes show_plot function to actually show the plot.
        return super(Difference, self).show_plot(lons, lats, data, True, basic=basic)