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Cannot solely remove M value of Shapefiles

0

I have a couple of Shapefiles which are of geometry type ZM (like PolygonZM, MultiLineStringZM, etc.), however my database (a PostGIS database) is of geometry type Z (like PolygonZ, MultiPointZ, etc.). When I import my shapefile into database, it will of course report an error. However, when I convert these Shapefiles, I find that M values cannot be removed without removing Z value.

Here are my efforts:

1. In ArcMap, use Feature Class to Feature Class in ArcToolbox, click "Environment" and disable M value there. However, output Shapefiles still have M values.

2. Using Export in QGIS, and choose PolygonZ or other geometry types with Z only in SHPT field. Again, output Shapefiles still have M values.

3. Use ogr2ogr. Here is the command line:

ogr2ogr -nlt polygonz new.shp old.shp

Again, output Shapefiles still have M values.

However, if I discard Z values as well:

ogr2ogr -nlt polygon new.shp old.shp

Output Shapefiles will have neither Z nor M values.

But when I try to add Z again, like:

ogr2ogr -nlt polygonz new1.shp new.shp

Both Z and M will be added, thus returning to PolygonZM.

Since these shapefiles have no actual Z values at all, I can safely discard Z values along with M values if I only need to deal with these files themselves. However, in my database, geometry columns are storing Z values, and they cannot be discarded. Can anyone tell me why can't I just discard M values and preserve Z values for these Shapefiles?

arcgis-desktop shapefile ogr2ogr z-value m-values

share

asked 1 min ago

Aurus HuangAurus Huang

1388

add a comment | 

0

I have a couple of Shapefiles which are of geometry type ZM (like PolygonZM, MultiLineStringZM, etc.), however my database (a PostGIS database) is of geometry type Z (like PolygonZ, MultiPointZ, etc.). When I import my shapefile into database, it will of course report an error. However, when I convert these Shapefiles, I find that M values cannot be removed without removing Z value.

Here are my efforts:

1. In ArcMap, use Feature Class to Feature Class in ArcToolbox, click "Environment" and disable M value there. However, output Shapefiles still have M values.

2. Using Export in QGIS, and choose PolygonZ or other geometry types with Z only in SHPT field. Again, output Shapefiles still have M values.

3. Use ogr2ogr. Here is the command line:

ogr2ogr -nlt polygonz new.shp old.shp

Again, output Shapefiles still have M values.

However, if I discard Z values as well:

ogr2ogr -nlt polygon new.shp old.shp

Output Shapefiles will have neither Z nor M values.

But when I try to add Z again, like:

ogr2ogr -nlt polygonz new1.shp new.shp

Both Z and M will be added, thus returning to PolygonZM.

Since these shapefiles have no actual Z values at all, I can safely discard Z values along with M values if I only need to deal with these files themselves. However, in my database, geometry columns are storing Z values, and they cannot be discarded. Can anyone tell me why can't I just discard M values and preserve Z values for these Shapefiles?

arcgis-desktop shapefile ogr2ogr z-value m-values

share

asked 1 min ago

Aurus HuangAurus Huang

1388

add a comment | 

I have a couple of Shapefiles which are of geometry type ZM (like PolygonZM, MultiLineStringZM, etc.), however my database (a PostGIS database) is of geometry type Z (like PolygonZ, MultiPointZ, etc.). When I import my shapefile into database, it will of course report an error. However, when I convert these Shapefiles, I find that M values cannot be removed without removing Z value.

Here are my efforts:

1. In ArcMap, use Feature Class to Feature Class in ArcToolbox, click "Environment" and disable M value there. However, output Shapefiles still have M values.

2. Using Export in QGIS, and choose PolygonZ or other geometry types with Z only in SHPT field. Again, output Shapefiles still have M values.

3. Use ogr2ogr. Here is the command line:

ogr2ogr -nlt polygonz new.shp old.shp

Again, output Shapefiles still have M values.

However, if I discard Z values as well:

ogr2ogr -nlt polygon new.shp old.shp

Output Shapefiles will have neither Z nor M values.

But when I try to add Z again, like:

ogr2ogr -nlt polygonz new1.shp new.shp

Both Z and M will be added, thus returning to PolygonZM.

Since these shapefiles have no actual Z values at all, I can safely discard Z values along with M values if I only need to deal with these files themselves. However, in my database, geometry columns are storing Z values, and they cannot be discarded. Can anyone tell me why can't I just discard M values and preserve Z values for these Shapefiles?

arcgis-desktop shapefile ogr2ogr z-value m-values

share

asked 1 min ago

Aurus HuangAurus Huang

1388

ogr2ogr -nlt polygonz new.shp old.shp

ogr2ogr -nlt polygon new.shp old.shp

ogr2ogr -nlt polygonz new1.shp new.shp

share

asked 1 min ago

Aurus HuangAurus Huang

1388

share

asked 1 min ago

Aurus HuangAurus Huang

1388

asked 1 min ago

Aurus HuangAurus Huang

1388

asked 1 min ago

Aurus HuangAurus Huang

1388