[mapserver-users] RE OGR csv - no field names

[Simon Mercier]

try to get it through your mapfile!  base on what I read here 
http://mapserver.org/input/vector/ogr.html#using-ogr-data-sources-in-the-map-file, 
you'll supposed to be able to add an SQL in DATA tag for any OGR data 
source, and there you should be able to select fid... I guess

LAYER
   ...
   CONNECTIONTYPE OGR
   CONNECTION "<datasource_name>"
   DATA "select fid, field_1, field_2, field_3 from <datasource_name>"
   ...
END


On 16-04-26 11:05 AM, Ian Walberg wrote:
> Simon,
>
> We tried this yesterday but could not see how to include the sql statement in the vrt file so that mapserver got an fid for each record.
>
> Thanks
>
> Ian
>
> -----Original Message-----
> From: Simon Mercier [mailto:smercier at mapgears.com]
> Sent: Tuesday, April 26, 2016 8:01 AM
> To: Ian Walberg <ian.walberg at airborne.aero>; mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] RE OGR csv - no field names
>
> Ian
>
> Try with FID field, OGR generate this ID for you. But you should try use your own ID field for consistency between version of your data (if needed). I tested with my demo data and I can select FID even if it doesn't exist in source file.
>
> <OGRVRTDataSource>
>       <OGRVRTLayer name="Inventory">
> <SrcDataSource>/home/smercier/data/vrt/Inventory.csv</SrcDataSource>
>           <GeometryType>wkbPoint</GeometryType>
>           <LayerSRS>EPSG:4326</LayerSRS>
>           <GeometryField encoding="PointFromColumns" x="longitude"
> y="latitude"/>
>           <Field name="site_name" src="SiteName"/>
>           <Field name="site_phone" src="SitePhone"/>
>           <Field name="site_type" src="SiteType"/>
>           <Field name="address" src="address"/>
>           <Field name="site_aed_placement" src="AEDPlacementLocation"/>
>       </OGRVRTLayer>
> </OGRVRTDataSource>
>
> smercier at optimus: $ ogrinfo Inventory.vrt -sql "select fid from Inventory"
> INFO: Open of `Inventory.vrt'
>         using driver `VRT' successful.
>
> Layer name: Inventory
> Geometry: Point
> Feature Count: 117
> Extent: (-80.977043, 0.000000) - (0.000000, 43.978620) 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"]]
> fid: Integer (0.0)
> OGRFeature(Inventory):1
>     fid (Integer) = 1
>     POINT (-80.2171407 43.4970847)
>
> OGRFeature(Inventory):2
>     fid (Integer) = 2
>     POINT (-80.5357573 43.8367679)
>
> OGRFeature(Inventory):3
>     fid (Integer) = 3
>     POINT (0 0)
> ....
>
>
> On 16-04-25 07:11 PM, Ian Walberg wrote:
>> Jeff,
>>
>> Many thanks that worked great.
>>
>> Next is there any way of getting the row ID as part of the data passed to mapserver?
>>
>> We are planning to serve this data as a WFS layer.
>>
>> Thanks
>>
>> Ian
>>
>> -----Original Message-----
>> From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org]
>> On Behalf Of Jeff McKenna
>> Sent: Monday, April 25, 2016 3:03 PM
>> To: mapserver-users at lists.osgeo.org
>> Subject: Re: [mapserver-users] RE OGR csv - no field names
>>
>> On 2016-04-25 6:49 PM, Simon Mercier wrote:
>>> really not sure CSVT file is supported by ogr, but you can easily
>>> define field type in VRT
>>>
>>>            <Field name="precipitation_mm" src="prec_mm" type="Real"/>
>>>            <Field name="field_1" src="field_1" type="String" width="100"
>>> />
>>>
>> Simon is right, very nice, specifying the field name to classify in the vrt works, for a csv without field names:
>>
>> <OGRVRTDataSource>
>>        <OGRVRTLayer name="occurrence">
>>            <SrcDataSource relativeToVRT="1">CSV:occurrence.txt</SrcDataSource>
>>            <GeometryType>wkbPoint</GeometryType>
>>            <LayerSRS>WGS84</LayerSRS>
>>            <GeometryField encoding="PointFromColumns" x="field_37"
>> y="field_38"/>
>>            <Field name="name" src="field_51" type="String" width="100"/>
>>        </OGRVRTLayer>
>> </OGRVRTDataSource>
>>
>>
>>
>> LAYER
>>      NAME "occurrence"
>>      TYPE POINT
>>      STATUS ON
>>      CONNECTIONTYPE OGR
>>      CONNECTION "../occurrence.vrt"
>>      CLASSITEM "name"
>>      CLASS
>>        NAME "Occurrences"
>>        EXPRESSION "ttt"
>>        STYLE
>>          SYMBOL 7
>>          SIZE 10
>>          COLOR 0 0 0
>>        END
>>      END
>> END # Layer
>>
>>
>> -jeff
>>
>>
>>
>>
>>
>> --
>> Jeff McKenna
>> MapServer Consulting and Training Services
>> http://www.gatewaygeomatics.com/
>>
>>
>>
>>
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> --
> simon mercier
> mapgears
> +1.418.476.7139 p101
>

-- 
simon mercier
mapgears
+1.418.476.7139 p101