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133 lines
3.8 KiB
Python
133 lines
3.8 KiB
Python
"""Generate heatmaps using ArcGIS.
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This script must be run from the version of python installed with ArcGIS, e.g.
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C:/Python27/ArcGIS10.4/python generate_heatmaps.py
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"""
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import os
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import re
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import sys
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import argparse
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from glob import glob
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import arcpy
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# Checkout Spatial Analyst toolbox to prevent licence errors
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arcpy.CheckOutExtension('Spatial')
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# Overwrite duplicate files
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arcpy.env.overwriteOutput = True
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def parse_yaml(yaml_name):
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"""Parse yaml file manually (when 'yaml' module is unavailable)
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Args:
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yaml_name: path to input yaml file
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Returns:
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dict of objects from yaml file
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"""
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with open(yaml_name, 'r') as f:
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yaml = f.read()
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# Fit wrapped strings on one line
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yaml = re.sub('\n\s', '', yaml)
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# Parse yaml file
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params = {}
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for line in yaml.split('\n'):
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if line:
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key, val = line.split(':', 1)
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params[key] = val.strip()
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return params
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def process(yaml_name):
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params = parse_yaml(yaml_name)
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beach = params['BEACH']
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base_name = os.path.splitext(os.path.basename(params['INPUT LAS']))[0]
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# Make all input and output paths absolute
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mxd_name = os.path.abspath(params['MAP DOCUMENT'])
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clip_poly = os.path.abspath(params['HEATMAP CROP POLY'])
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symb_lyr_name = os.path.abspath(params['SYMBOLOGY LAYER'])
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input_tif_dir = os.path.abspath(params['TIF DEM FOLDER'])
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output_tif_dir = os.path.abspath(params['TIF HEATMAP FOLDER'])
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# Check if previous survey date was provided
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previous_date = params['PREVIOUS SURVEY DATE']
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try:
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int(previous_date)
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except ValueError:
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raise ValueError('No previous survey date provided')
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# Set paths for raster files
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current_raster = os.path.join(input_tif_dir, base_name + '.tif')
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previous_base_name = re.sub('\d+', previous_date, base_name)
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previous_raster = os.path.join(input_tif_dir, previous_base_name + '.tif')
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heatmap_raster = os.path.join(output_tif_dir, base_name + '.tif')
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print('processing {}'.format(beach))
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# Save heatmap in memory
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heatmap_memory = 'in_memory/' + base_name
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# Subtract the previous raster from the current raster
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arcpy.Minus_3d(
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in_raster_or_constant1=current_raster,
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in_raster_or_constant2=previous_raster,
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out_raster=heatmap_memory)
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# Clip the heatmap
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arcpy.Clip_management(
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in_raster=heatmap_memory,
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rectangle='350000 6290000 360000 6300000',
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out_raster=heatmap_raster,
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in_template_dataset=clip_poly,
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nodata_value='-9.999000e+003',
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clipping_geometry='ClippingGeometry',
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maintain_clipping_extent='NO_MAINTAIN_EXTENT')
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def main():
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example_text = """examples:
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# Process single survey at specific beach
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C:/Python27/ArcGIS10.4/python generate_heatmaps.py survey-1-avoca.yaml
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# Process single survey at multiple beaches
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C:/Python27/ArcGIS10.4/python generate_heatmaps.py survey-1-avoca.yaml survey-1-pearl.yaml
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# Process all surveys at specific beach
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C:/Python27/ArcGIS10.4/python generate_heatmaps.py *avoca.yaml
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# Process all beaches for specific survey date
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C:/Python27/ArcGIS10.4/python generate_heatmaps.py survey-1*.yaml
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"""
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# Set up command line arguments
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parser = argparse.ArgumentParser(
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epilog=example_text,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument('input', help='path to yaml file(s)', nargs='*')
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# Print usage if no arguments are provided
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if len(sys.argv) == 1:
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parser.print_help(sys.stderr)
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sys.exit(1)
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# Parse arguments
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args = parser.parse_args()
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yaml_files = []
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[yaml_files.extend(glob(f)) for f in args.input]
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for yaml_file in yaml_files:
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process(yaml_file)
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if __name__ == '__main__':
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main()
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