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Merge pull request #5769 from geographika/python-mapscript-examples
Update Python MapScript examples
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,50 +1,70 @@ | ||
| #!/usr/bin/python | ||
| # | ||
| # Script : project_csv.py | ||
| # | ||
| # Purpose: Simple example to read a csv file and reproject point x/y data | ||
| # | ||
| # $Id$ | ||
| # | ||
|
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| import sys | ||
| import csv | ||
| import mapscript | ||
|
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| # example invocation | ||
| # ./reproj.py ./foo.csv 2 3 EPSG:32619 EPSG:4326 | ||
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| # check input parameters | ||
| if (len(sys.argv) != 6): | ||
| print sys.argv[0] + \ | ||
| " <csvfile> <x_col> <y_col> <epsg_code_in> <epsg_code_out>" | ||
| sys.exit(1) | ||
| else: | ||
| # set x and y indices | ||
| x = int(sys.argv[2]) | ||
| y = int(sys.argv[3]) | ||
|
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| # set input and output projections | ||
| projObjIn = mapscript.projectionObj("init="+sys.argv[4].lower()) | ||
| projObjOut = mapscript.projectionObj("init="+sys.argv[5].lower()) | ||
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| # open file | ||
| fCsv = open(sys.argv[1], 'r') | ||
|
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| # read csv | ||
| csvIn = csv.reader(fCsv) | ||
| # setup output | ||
| csvOut = csv.writer(sys.stdout) | ||
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| for aRow in csvIn: # each record | ||
| # set pointObj | ||
| point = mapscript.pointObj(float(aRow[x]), float(aRow[y])) | ||
| # project | ||
| point.project(projObjIn, projObjOut) | ||
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| # update with reprojected coordinates | ||
| aRow[x] = point.x | ||
| aRow[y] = point.y | ||
|
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| csvOut.writerow(aRow) | ||
| fCsv.close() | ||
| """ | ||
| Simple example to read a csv file and reproject point x/y data | ||
| Usage: | ||
| project_csv.py cities.csv 2 1 EPSG:4326 EPSG:3857 | ||
| """ | ||
|
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| import sys | ||
| import csv | ||
| from io import open | ||
| import mapscript | ||
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| def main(input_file, x_field_idx, y_field_idx, input_proj, output_proj): | ||
|
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| # set input and output projections | ||
| proj_in = mapscript.projectionObj(input_proj) | ||
| proj_out = mapscript.projectionObj(output_proj) | ||
|
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| # open file | ||
| with open(input_file, encoding='utf-8') as f: | ||
| # read csv | ||
| csv_in = csv.reader(f) | ||
| headers = next(csv_in) | ||
|
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| # setup output | ||
| csv_out = csv.writer(sys.stdout) | ||
| csv_out.writerow(headers) | ||
|
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| for row in csv_in: | ||
| # set pointObj | ||
| point = mapscript.pointObj(float(row[x_field_idx]), float(row[y_field_idx])) | ||
| # project | ||
| point.project(proj_in, proj_out) | ||
|
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| # update with reprojected coordinates | ||
| row[x_field_idx] = point.x | ||
| row[y_field_idx] = point.y | ||
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| csv_out.writerow(row) | ||
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| def usage(): | ||
| """ | ||
| Display usage if program is used incorrectly | ||
| """ | ||
| print("Syntax: %s <csvfile> <x_col> <y_col> <epsg_code_in> <epsg_code_out>" % sys.argv[0]) | ||
| sys.exit(2) | ||
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| # check input parameters | ||
|
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| if (len(sys.argv) != 6): | ||
| usage() | ||
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| input_file = sys.argv[1] | ||
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| # set x and y indices | ||
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| x_field_idx = int(sys.argv[2]) | ||
| y_field_idx = int(sys.argv[3]) | ||
|
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| # get projection codes | ||
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| input_proj = "init="+sys.argv[4].lower() | ||
| output_proj = "init="+sys.argv[5].lower() | ||
| main(input_file, x_field_idx, y_field_idx, input_proj, output_proj) |
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