Re: [mapserver-users] Apply style to geojson based on property in geojson data

[Richard Greenwood]

Expressions are easy to mess up. To test if "value" is getting thru the
drive try using it as a label. That might help you to narrow down the
problem.

LABELITEM "value"
. . .
CLASS
. . .
LABEL
. . .
END
END

On Wed, Oct 25, 2017 at 2:08 AM, Tuffa 
wrote:

> Hello Richard!
>
> > I haven't used geojson as a data source, but maybe if you shared a small
> > example of your map file and the data it would help.
>
> Here's some more information
>
> mapfile.map (excerpt):
>
>   LAYER
> NAME "countries"
> STATUS OFF
> TYPE POLYGON
> CONNECTIONTYPE OGR
> CONNECTION "africa.geojson"
> DATA "select * from africa"
> CLASS STYLE OUTLINECOLOR "#ff" END END
> CLASS EXPRESSION ([value] >= 0 AND [value] <= 100) STYLE COLOR
> "#FFE397" END END
>   END
>
> I have tried numerous types of select statement in the DATA definition, but
> have failed to influence the styling based on the ‘value’ property added to
> the geojson file.  Of course, this may have all been in vain, if the GDAL
> driver does not support anything other than ‘select * from ’, but I
> cannot tell from the documentation - MapServer, or GDAL - what is allowed.
>
> Here is an excerpt of the africa.geojson file, with the additional property
> ‘value’ added.  Following is the output from ogrinfo.
>
> {
> "features": [
> {
> "geometry": {
> "coordinates": [
> [
> [
> [
> 8.621624,
> 36.941797
> ],
> [
> 8.621624,
> 36.941797
> ]
> ]
> ]
> ],
> "type": "MultiPolygon"
> },
> "properties": {
> "cartodb_id": 1,
> "created_at": "2013-11-12T16:15:59+0100",
> "name": "Algeria",
> "updated_at": "2013-11-12T16:15:59+0100",
> "value": 1   custom
> property
> },
> "type": "Feature"
> }
> ],
> "type": "FeatureCollection"
> }
>
>
> chris:tmp chris$ ogrinfo -summary -al africa.geojson
> INFO: Open of `africa.geojson'
>   using driver `GeoJSON' successful.
>
> Layer name: africa
> Geometry: Multi Polygon
> Feature Count: 1
> Extent: (8.621624, 36.941797) - (8.621624, 36.941797)
> Layer SRS WKT:
> GEOGCS["WGS 84",
> DATUM["WGS_1984",
> SPHEROID["WGS 84",6378137,298.257223563,
> AUTHORITY["EPSG","7030"]],
> AUTHORITY["EPSG","6326"]],
> PRIMEM["Greenwich",0,
> AUTHORITY["EPSG","8901"]],
> UNIT["degree",0.0174532925199433,
> AUTHORITY["EPSG","9122"]],
> AUTHORITY["EPSG","4326"]]
> value: Integer (0.0)   here’s the
> additional
> property
> cartodb_id: Integer (0.0)
> created_at: DateTime (0.0)
> name: String (0.0)
> updated_at: DateTime (0.0)
>
>
> I haven't used geojson as a data source, but maybe if you shared a small
> example of your map file and the data it would help.
>
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/Mapserver-User-
> f4226646.html
> ___
> mapserver-users mailing list
> mapserver-users@lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-users
>



-- 
Richard W. Greenwood, PLS
www.greenwoodmap.com
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/mapserver-users

Re: [mapserver-users] Apply style to geojson based on property in geojson data

[Tuffa]

Hello Richard!

> I haven't used geojson as a data source, but maybe if you shared a small
> example of your map file and the data it would help.

Here's some more information

mapfile.map (excerpt):

  LAYER
NAME "countries"
STATUS OFF
TYPE POLYGON
CONNECTIONTYPE OGR
CONNECTION "africa.geojson"
DATA "select * from africa"  
CLASS STYLE OUTLINECOLOR "#ff" END END
CLASS EXPRESSION ([value] >= 0 AND [value] <= 100) STYLE COLOR
"#FFE397" END END
  END

I have tried numerous types of select statement in the DATA definition, but
have failed to influence the styling based on the ‘value’ property added to
the geojson file.  Of course, this may have all been in vain, if the GDAL
driver does not support anything other than ‘select * from ’, but I
cannot tell from the documentation - MapServer, or GDAL - what is allowed.

Here is an excerpt of the africa.geojson file, with the additional property
‘value’ added.  Following is the output from ogrinfo.

{
"features": [
{
"geometry": {
"coordinates": [
[
[
[
8.621624,
36.941797
],
[
8.621624,
36.941797
]
]
]
],
"type": "MultiPolygon"
},
"properties": {
"cartodb_id": 1,
"created_at": "2013-11-12T16:15:59+0100",
"name": "Algeria",
"updated_at": "2013-11-12T16:15:59+0100",
"value": 1   custom
property
},
"type": "Feature"
}
],
"type": "FeatureCollection"
}


chris:tmp chris$ ogrinfo -summary -al africa.geojson 
INFO: Open of `africa.geojson'
  using driver `GeoJSON' successful.

Layer name: africa
Geometry: Multi Polygon
Feature Count: 1
Extent: (8.621624, 36.941797) - (8.621624, 36.941797)
Layer SRS WKT:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4326"]]
value: Integer (0.0)   here’s the additional
property
cartodb_id: Integer (0.0)
created_at: DateTime (0.0)
name: String (0.0)
updated_at: DateTime (0.0)


I haven't used geojson as a data source, but maybe if you shared a small
example of your map file and the data it would help.




--
Sent from: http://osgeo-org.1560.x6.nabble.com/Mapserver-User-f4226646.html
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/mapserver-users

Re: [mapserver-users] Apply style to geojson based on property in geojson data

[Richard Greenwood]

I haven't used geojson as a data source, but maybe if you shared a small
example of your map file and the data it would help.

On Tue, Oct 24, 2017 at 8:43 AM, Tuffa 
wrote:

> Hello!
>
> I am rendering a map of African countries from a single geojson file.  Each
> country is represented as a feature with geometry.  I've added a custom
> value to each feature's properties, that I would like to influence the
> style
> selected by MapServer to render the country outline, however I cannot see
> how it is possible to configure the layer so that MapServer uses the new
> 'value' property as the input for the style expressions that I have
> created...
>
> Doing the same job, using a database as the datasource is easy!  I simply
> craft a SQL 'select' statement for the mapfile's Layer 'DATA' to retrieve
> the desired value and it becomes available to MapServer using the
> '[value_name]' syntax in style expressions.
>
> This same approach does not appear to work for GeoJSON.  MapServer states
> that the extent of support for the 'DATA' is driver-dependant, which is
> fair
> enough; examination of the geoJson driver doc in the GDAL doc's does not
> help me though.
>
> Can anyone help?
>
> Regards
> Chris
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/Mapserver-User-
> f4226646.html
> ___
> mapserver-users mailing list
> mapserver-users@lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-users




-- 
Richard W. Greenwood, PLS
www.greenwoodmap.com
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/mapserver-users

[mapserver-users] Apply style to geojson based on property in geojson data

[Tuffa]

Hello!

I am rendering a map of African countries from a single geojson file.  Each
country is represented as a feature with geometry.  I've added a custom
value to each feature's properties, that I would like to influence the style
selected by MapServer to render the country outline, however I cannot see
how it is possible to configure the layer so that MapServer uses the new
'value' property as the input for the style expressions that I have
created...

Doing the same job, using a database as the datasource is easy!  I simply
craft a SQL 'select' statement for the mapfile's Layer 'DATA' to retrieve
the desired value and it becomes available to MapServer using the
'[value_name]' syntax in style expressions.  

This same approach does not appear to work for GeoJSON.  MapServer states
that the extent of support for the 'DATA' is driver-dependant, which is fair
enough; examination of the geoJson driver doc in the GDAL doc's does not
help me though.  

Can anyone help?  

Regards
Chris



--
Sent from: http://osgeo-org.1560.x6.nabble.com/Mapserver-User-f4226646.html
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/mapserver-users