##--FUNCTIONS--
def msg(txt):
print txt
arcpy.AddMessage(txt)
return
##--PROCESSES--
# Extract development from NLCD
msg("Extracting developed area from NLCD")
devBinary = sa.Con(nlcdRaster, 1, 0, "VALUE IN (22,23,24)")
# Compute focal mean of development
msg("Calculating focal stats")
nbrHood = sa.NbrCircle(distanceThreshold, "MAP")
focalMean = sa.FocalStatistics(devBinary, nbrHood, "MEAN")
# Compute distance decay
msg("Computing distance decayed development")
devNodata = sa.Con(nlcdRaster, 1, '', "VALUE IN (22,23,24)")
eucDist = sa.EucDistance(devNodata)
k = math.log(0.01) / distanceThreshold
devDecay = sa.Exp(eucDist * k)
# FOCAL MEAN: Compute zonal stats
msg("Computing patch threat values")
tmpTable = "in_memory/TmpTable"
sa.ZonalStatisticsAsTable(patchRaster, "VALUE", devBinary, tmpTable, '',
"MEAN")
GeoHATutils.RenameField(tmpTable, "MEAN", "FocalMean")
# f2: surface change
arcpy.AddMessage("Surface Curvature ...")
f2 = os.path.join(env.scratchFolder,"f2.tif")
if debug == True: arcpy.AddMessage(str(time.strftime("Curvature: %m/%d/%Y %H:%M:%S", time.localtime())))
# CURVATURE
curvature = os.path.join(scratch,"curvature")
curveSA = sa.Curvature(elevClip)
curveSA.save(curvature)
deleteme.append(curvature)
if debug == True: arcpy.AddMessage(str(time.strftime("Focal Stats: %m/%d/%Y %H:%M:%S", time.localtime())))
# FOCALSTATISTICS (RANGE)
focalStats = os.path.join(scratch,"focalStats")
window = sa.NbrCircle(3,"CELL")
fstatsSA = sa.FocalStatistics(curvature,window,"RANGE")
fstatsSA.save(focalStats)
deleteme.append(focalStats)
# F2
maxRasStat = float(str(arcpy.GetRasterProperties_management(focalStats,"MAXIMUM")))
fsRasStat = sa.Raster(focalStats)
if debug == True:
arcpy.AddMessage("maxRasStat: " + str(maxRasStat) + " - " + str(type(maxRasStat)))
arcpy.AddMessage("fsRasStat: " + str(fsRasStat) + " - " + str(type(fsRasStat)))
f2Calc = (maxRasStat - fsRasStat) / maxRasStat # (max - cell/max)
f2Calc.save(f2)
deleteme.append(f2)
ccmFactorList.append(f2)
#TODO: Need more thorough and complete checks of inputs
if inputVegetation != types.NoneType and arcpy.Exists(inputVegetation) == True:
def rasterToVector(self, inFileName_, filtering_, delArea_):
"""
Program description:
Normalized-Difference Snow Index (NDSI)
INPUT_PARAMETERS:
inputValue_ -
COMMENTS:
"""
#-------------------------------------------------------------------------------
#Raster Filtering
pBinRatio = sa.Raster(inFileName_)
print "Start filtering raster..."
if filtering_ == 'median': #3x3 Median Filter #--> Best result
pFiltBinRatio = sa.FocalStatistics(
pBinRatio, sa.NbrRectangle(3, 3, "CELL"), "MEDIAN"
) #Spatial Analyst Tools --> Neighborhood: Focal Statistics
elif filtering_ == 'closing': #Erosion / Dilatation (Closing) instead of Median
pShrinkBinRatio = sa.Shrink(
pBinRatio, 1, [0]
) #Spatial Analyst Tools --> Generalization: Shrink ... Expand: One cell
pFiltBinRatio = sa.Expand(
pShrinkBinRatio, 1,
[0]) # Closing value '0', so no-glacier area, one pixel size
else:
raise Exception("Error: No filtering approach chosen")
outFileName = str(filtering_) + "_" + pBinRatio.name
pFiltBinRatio.save(outFileName)
print "Binary ratio image '" + str(
outFileName) + "' with filtering method '" + str(
filtering_) + "' created."
#-------------------------------------------------------------------------------
#Convert Raster to Polygon
outFileName = outFileName.rsplit(".")[
0] #Get filename without ".tif" extension
outFileName = "vec_" + outFileName.rsplit(
"arcpy"
)[0] + ".shp" #Split filename at code 'arcpy' to shorten filenmame for following methods (methods fail if output filename is too long)
#Conversion Tools --> From Rater: Raster to Polygon
print "Start converting raster to polygon..."
arcpy.RasterToPolygon_conversion(
pFiltBinRatio, outFileName, "NO_SIMPLIFY",
"VALUE") #No simplify of output polygon
print "Raster converted to polygon '" + str(outFileName) + "'."
#-------------------------------------------------------------------------------
#Postprocessing
#Data Management Tools --> Generalization: Eliminate Polygon Part --> Eliminates small islands in the polygon and outside
inFileName = outFileName
outFileName = "elim_" + inFileName
print "Start eliminating polygon parts..."
dm.EliminatePolygonPart(
inFileName, outFileName, "AREA", delArea_
) #, "", "ANY") # not CONTAINED_ONLY #Eliminate areas smaller 0.01 km^2 = 10000 Square Meters
print "Polygon '" + str(
inFileName) + "' eliminated polygon parts of '" + str(
delArea_) + "' to '" + str(outFileName) + "'."
#Cartography Tools --> Generalization: Aggregate Polygons
#ca.AggregatePolygons("buildings.shp", "C:/output/output.gdb/aggregated_buildings", 10)
# Not suitable in this case!
#Cartography Tools --> Generalization: Simplify Polygon with Point Remove
inFileName = outFileName
outFileName = "simp_" + inFileName
tolerance = float(
pBinRatio.meanCellWidth) #Cell Size: SRTM: 90m, Landsat: 30m
print "Start simplyfing polygon..."
ca.SimplifyPolygon(
inFileName, outFileName, "POINT_REMOVE", tolerance, delArea_,
"RESOLVE_ERRORS", "KEEP_COLLAPSED_POINTS"
) #SQR(15^2+15^2) ~ 22m; Eliminate areas smaller 0.01 km^2 = 10000 Square Meters
print "Polygon '" + str(
inFileName) + "' simplified to polygon '" + str(
outFileName) + "' with deleted areas of '" + str(
delArea_) + "' and maximal tolerance of '" + str(
tolerance) + "'."
#Cartography Tools --> Generalization: Smooth Polygon with PEAK
inFileName = outFileName
outFileName = "smooth_" + inFileName
tolerance = 2 * float(
pBinRatio.meanCellWidth) #2*Cell Size: SRTM: 180m, Landsat: 60m
print "Start smoothing polygon..."
ca.SmoothPolygon(inFileName, outFileName, "PAEK", tolerance,
"FIXED_ENDPOINT", "FLAG_ERRORS")
print "Polygon '" + str(inFileName) + "' smoothed to polygon '" + str(
outFileName) + "' with maximal tolerance of '" + str(
tolerance) + "'."
return
