def get_elevations_for_flight(flight):
cached_elevations = cache.get("elevations_" + flight.__repr__())
if cached_elevations:
return cached_elevations
"""
WITH src AS
(SELECT ST_DumpPoints(flights.locations) AS location,
flights.timestamps AS timestamps,
flights.locations AS locations
FROM flights
WHERE flights.id = 30000)
SELECT timestamps[(src.location).path[1]] AS timestamp,
ST_Value(elevations.rast, (src.location).geom) AS elevation
FROM elevations, src
WHERE src.locations && elevations.rast AND (src.location).geom && elevations.rast;
"""
# Prepare column expressions
location = Flight.locations.ST_DumpPoints()
# Prepare cte
cte = (
db.session.query(
location.label("location"), Flight.locations.label("locations"), Flight.timestamps.label("timestamps")
)
.filter(Flight.id == flight.id)
.cte()
)
# Prepare column expressions
timestamp = literal_column("timestamps[(location).path[1]]")
elevation = Elevation.rast.ST_Value(cte.c.location.geom)
# Prepare main query
q = (
db.session.query(timestamp.label("timestamp"), elevation.label("elevation"))
.filter(and_(cte.c.locations.intersects(Elevation.rast), cte.c.location.geom.intersects(Elevation.rast)))
.all()
)
if len(q) == 0:
return []
start_time = q[0][0]
start_midnight = start_time.replace(hour=0, minute=0, second=0, microsecond=0)
elevations = []
for time, elevation in q:
if elevation is None:
continue
time_delta = time - start_midnight
time = time_delta.days * 86400 + time_delta.seconds
elevations.append((time, elevation))
cache.set("elevations_" + flight.__repr__(), elevations, timeout=3600 * 24)
return elevations
def get_elevations_for_flight(flight):
cached_elevations = cache.get('elevations_' + flight.__repr__())
if cached_elevations:
return cached_elevations
'''
WITH src AS
(SELECT ST_DumpPoints(flights.locations) AS location,
flights.timestamps AS timestamps,
flights.locations AS locations
FROM flights
WHERE flights.id = 30000)
SELECT timestamps[(src.location).path[1]] AS timestamp,
ST_Value(elevations.rast, (src.location).geom) AS elevation
FROM elevations, src
WHERE src.locations && elevations.rast AND (src.location).geom && elevations.rast;
'''
# Prepare column expressions
location = Flight.locations.ST_DumpPoints()
# Prepare cte
cte = db.session.query(location.label('location'),
Flight.locations.label('locations'),
Flight.timestamps.label('timestamps')) \
.filter(Flight.id == flight.id).cte()
# Prepare column expressions
timestamp = literal_column('timestamps[(location).path[1]]')
elevation = Elevation.rast.ST_Value(cte.c.location.geom)
# Prepare main query
q = db.session.query(timestamp.label('timestamp'),
elevation.label('elevation')) \
.filter(and_(cte.c.locations.intersects(Elevation.rast),
cte.c.location.geom.intersects(Elevation.rast))).all()
if len(q) == 0:
return []
start_time = q[0][0]
start_midnight = start_time.replace(hour=0,
minute=0,
second=0,
microsecond=0)
elevations = []
for time, elevation in q:
if elevation is None:
continue
time_delta = time - start_midnight
time = time_delta.days * 86400 + time_delta.seconds
elevations.append((time, elevation))
cache.set('elevations_' + flight.__repr__(), elevations, timeout=3600 * 24)
return elevations
def airspace_image(cache_key, airspace_id):
if not mapscript_available:
abort(404)
# get information from cache...
infringements = cache.get('upload_airspace_infringements_' + cache_key)
flight_path = cache.get('upload_airspace_flight_path_' + cache_key)
# abort if invalid cache key
if not infringements \
or not flight_path:
abort(404)
# Convert the coordinate into a list of tuples
coordinates = [(c.location['longitude'], c.location['latitude'])
for c in flight_path]
# Create a shapely LineString object from the coordinates
linestring = LineString(coordinates)
# Save the new path as WKB
locations = from_shape(linestring, srid=4326)
highlight_locations = []
extent_epsg4326 = [180, 85.05112878, -180, -85.05112878]
for period in infringements[airspace_id]:
# Convert the coordinate into a list of tuples
coordinates = [(c['location']['longitude'], c['location']['latitude'])
for c in period]
# Create a shapely LineString object from the coordinates
if len(coordinates) == 1:
# a LineString must contain at least two points...
linestring = LineString([coordinates[0], coordinates[0]])
else:
linestring = LineString(coordinates)
highlight_locations.append(linestring)
# gather extent
(minx, miny, maxx, maxy) = linestring.bounds
extent_epsg4326[0] = min(extent_epsg4326[0], minx)
extent_epsg4326[1] = min(extent_epsg4326[1], miny)
extent_epsg4326[2] = max(extent_epsg4326[2], maxx)
extent_epsg4326[3] = max(extent_epsg4326[3], maxy)
# Save the new path as WKB
highlight_multilinestring = from_shape(
MultiLineString(highlight_locations), srid=4326)
# increase extent by factor 1.05
width = abs(extent_epsg4326[0] - extent_epsg4326[2])
height = abs(extent_epsg4326[1] - extent_epsg4326[3])
center_x = (extent_epsg4326[0] + extent_epsg4326[2]) / 2
center_y = (extent_epsg4326[1] + extent_epsg4326[3]) / 2
extent_epsg4326[0] = center_x - width / 2 * 1.05
extent_epsg4326[1] = center_y - height / 2 * 1.05
extent_epsg4326[2] = center_x + width / 2 * 1.05
extent_epsg4326[3] = center_y + height / 2 * 1.05
# minimum extent should be 0.3 deg
width = abs(extent_epsg4326[0] - extent_epsg4326[2])
height = abs(extent_epsg4326[1] - extent_epsg4326[3])
if width < 0.3:
extent_epsg4326[0] = center_x - 0.15
extent_epsg4326[2] = center_x + 0.15
if height < 0.3:
extent_epsg4326[1] = center_y - 0.15
extent_epsg4326[3] = center_y + 0.15
# convert extent from EPSG4326 to EPSG3857
epsg4326 = pyproj.Proj(init='epsg:4326')
epsg3857 = pyproj.Proj(init='epsg:3857')
x1, y1 = pyproj.transform(epsg4326, epsg3857, extent_epsg4326[0],
extent_epsg4326[1])
x2, y2 = pyproj.transform(epsg4326, epsg3857, extent_epsg4326[2],
extent_epsg4326[3])
extent_epsg3857 = [x1, y1, x2, y2]
# load basemap and set size + extent
basemap_path = os.path.join(
current_app.config.get('SKYLINES_MAPSERVER_PATH'), 'basemap.map')
map_object = mapscript.mapObj(basemap_path)
map_object.setSize(400, 400)
map_object.setExtent(extent_epsg3857[0], extent_epsg3857[1],
extent_epsg3857[2], extent_epsg3857[3])
# enable airspace and airports layers
num_layers = map_object.numlayers
for i in range(num_layers):
layer = map_object.getLayer(i)
if layer.group == 'Airports':
layer.status = mapscript.MS_ON
if layer.group == 'Airspace':
layer.status = mapscript.MS_ON
# get flights layer
flights_layer = map_object.getLayerByName('Flights')
highlight_layer = map_object.getLayerByName('Flights_Highlight')
# set sql query for blue flight
one = literal_column('1 as flight_id')
flight_query = db.session.query(locations.label('flight_geometry'), one)
flights_layer.data = 'flight_geometry FROM (' + query_to_sql(flight_query) + ')' + \
' AS foo USING UNIQUE flight_id USING SRID=4326'
# set sql query for highlighted linestrings
highlighted_query = db.session.query(
highlight_multilinestring.label('flight_geometry'), one)
highlight_layer.data = 'flight_geometry FROM (' + query_to_sql(highlighted_query) + ')' + \
' AS foo USING UNIQUE flight_id USING SRID=4326'
highlight_layer.status = mapscript.MS_ON
# get osm layer and set WMS url
osm_layer = map_object.getLayerByName('OSM')
osm_layer.connection = current_app.config.get('SKYLINES_MAP_TILE_URL') + \
'/service?'
# draw map
map_image = map_object.draw()
# get image
mapscript.msIO_installStdoutToBuffer()
map_image.write()
content = mapscript.msIO_getStdoutBufferBytes()
# return to client
resp = make_response(content)
resp.headers['Content-type'] = map_image.format.mimetype
return resp
def airspace_image(cache_key, airspace_id):
if not mapscript_available:
abort(404)
# get information from cache...
infringements = cache.get('upload_airspace_infringements_' + cache_key)
flight_path = cache.get('upload_airspace_flight_path_' + cache_key)
# abort if invalid cache key
if not infringements \
or not flight_path:
abort(404)
# Convert the coordinate into a list of tuples
coordinates = [(c.location['longitude'], c.location['latitude']) for c in flight_path]
# Create a shapely LineString object from the coordinates
linestring = LineString(coordinates)
# Save the new path as WKB
locations = from_shape(linestring, srid=4326)
highlight_locations = []
extent_epsg4326 = [180, 85.05112878, -180, -85.05112878]
for period in infringements[airspace_id]:
# Convert the coordinate into a list of tuples
coordinates = [(c['location']['longitude'], c['location']['latitude']) for c in period]
# Create a shapely LineString object from the coordinates
if len(coordinates) == 1:
# a LineString must contain at least two points...
linestring = LineString([coordinates[0], coordinates[0]])
else:
linestring = LineString(coordinates)
highlight_locations.append(linestring)
# gather extent
(minx, miny, maxx, maxy) = linestring.bounds
extent_epsg4326[0] = min(extent_epsg4326[0], minx)
extent_epsg4326[1] = min(extent_epsg4326[1], miny)
extent_epsg4326[2] = max(extent_epsg4326[2], maxx)
extent_epsg4326[3] = max(extent_epsg4326[3], maxy)
# Save the new path as WKB
highlight_multilinestring = from_shape(MultiLineString(highlight_locations), srid=4326)
# increase extent by factor 1.05
width = abs(extent_epsg4326[0] - extent_epsg4326[2])
height = abs(extent_epsg4326[1] - extent_epsg4326[3])
center_x = (extent_epsg4326[0] + extent_epsg4326[2]) / 2
center_y = (extent_epsg4326[1] + extent_epsg4326[3]) / 2
extent_epsg4326[0] = center_x - width / 2 * 1.05
extent_epsg4326[1] = center_y - height / 2 * 1.05
extent_epsg4326[2] = center_x + width / 2 * 1.05
extent_epsg4326[3] = center_y + height / 2 * 1.05
# minimum extent should be 0.3 deg
width = abs(extent_epsg4326[0] - extent_epsg4326[2])
height = abs(extent_epsg4326[1] - extent_epsg4326[3])
if width < 0.3:
extent_epsg4326[0] = center_x - 0.15
extent_epsg4326[2] = center_x + 0.15
if height < 0.3:
extent_epsg4326[1] = center_y - 0.15
extent_epsg4326[3] = center_y + 0.15
# convert extent from EPSG4326 to EPSG3857
epsg4326 = pyproj.Proj(init='epsg:4326')
epsg3857 = pyproj.Proj(init='epsg:3857')
x1, y1 = pyproj.transform(epsg4326, epsg3857, extent_epsg4326[0], extent_epsg4326[1])
x2, y2 = pyproj.transform(epsg4326, epsg3857, extent_epsg4326[2], extent_epsg4326[3])
extent_epsg3857 = [x1, y1, x2, y2]
# load basemap and set size + extent
basemap_path = os.path.join(current_app.config.get('SKYLINES_MAPSERVER_PATH'), 'basemap.map')
map_object = mapscript.mapObj(basemap_path)
map_object.setSize(400, 400)
map_object.setExtent(extent_epsg3857[0], extent_epsg3857[1], extent_epsg3857[2], extent_epsg3857[3])
# enable airspace and airports layers
num_layers = map_object.numlayers
for i in range(num_layers):
layer = map_object.getLayer(i)
if layer.group == 'Airports':
layer.status = mapscript.MS_ON
if layer.group == 'Airspace':
layer.status = mapscript.MS_ON
# get flights layer
flights_layer = map_object.getLayerByName('Flights')
highlight_layer = map_object.getLayerByName('Flights_Highlight')
# set sql query for blue flight
one = literal_column('1 as flight_id')
flight_query = db.session.query(locations.label('flight_geometry'), one)
flights_layer.data = 'flight_geometry FROM (' + query_to_sql(flight_query) + ')' + \
' AS foo USING UNIQUE flight_id USING SRID=4326'
# set sql query for highlighted linestrings
highlighted_query = db.session.query(highlight_multilinestring.label('flight_geometry'), one)
highlight_layer.data = 'flight_geometry FROM (' + query_to_sql(highlighted_query) + ')' + \
' AS foo USING UNIQUE flight_id USING SRID=4326'
highlight_layer.status = mapscript.MS_ON
# get osm layer and set WMS url
osm_layer = map_object.getLayerByName('OSM')
osm_layer.connection = current_app.config.get('SKYLINES_MAP_TILE_URL') + \
'/service?'
# draw map
map_image = map_object.draw()
# get image
mapscript.msIO_installStdoutToBuffer()
map_image.write()
content = mapscript.msIO_getStdoutBufferBytes()
# return to client
resp = make_response(content)
resp.headers['Content-type'] = map_image.format.mimetype
return resp
