Processing csv data with gdal and friends
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August 29, 2015 14:05
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csv processing
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| a | b | c | LATITUDE | LONGITUDE | |
|---|---|---|---|---|---|
| 1 | 2 | 3 | 48 | -120 | |
| 4 | 5 | 6 | 30 | -90 |
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| SOURCE_DATA = test.csv | |
| CLEAN_DATA = clean.csv | |
| GENERATED_FILES = test.json | |
| $(GENERATED_FILES): $(CLEAN_DATA) | |
| @topojson -x 'LONGITUDE' -y 'LATITUDE' -o $@ $^ | |
| test: $(CLEAN_DATA) | |
| ogrinfo -ro -al $(CLEAN_DATA) | |
| info: $(GENERATED_FILES) | |
| @echo "Here's the info..." | |
| ogrinfo -ro -so test.vrt | |
| ogrinfo -dialect SQLITE -sql 'SELECT LATITUDE FROM clean LIMIT 2 OFFSET 1' -ro -al test.vrt | |
| $(CLEAN_DATA): $(SOURCE_DATA) | |
| @echo Making $(CLEAN_DATA) | |
| @sed 1d $^ > $@ # remove first line = column names (possibly created by ogr2ogr conversion of xlxs | |
| clean: | |
| -rm $(CLEAN_DATA) |
We can make this file beautiful and searchable if this error is corrected: It looks like row 2 should actually have 1 column, instead of 5 in line 1.
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| this is the silly line that's causing me a headache | |
| a,b,c,LATITUDE,LONGITUDE | |
| 1,2,3,48,-120 | |
| 4,5,6,30,-90 |
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| <OGRVRTDataSource> | |
| <OGRVRTLayer name="clean"> | |
| <SrcDataSource>clean.csv</SrcDataSource> | |
| <GeometryType>wkbPoint</GeometryType> | |
| <LayerSRS>WGS84</LayerSRS> | |
| <GeometryField encoding="PointFromColumns" x="LONGITUDE" y="LATITUDE"/> | |
| </OGRVRTLayer> | |
| </OGRVRTDataSource> |
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