[gdal-dev] Labeling rasters

[Chaitanya kumar CH]

Jerl,

The contour attribute and the Z values are same here. Just one of them is
enough.

With the Z values near the magnitude of 1000, the burn value of 255 is not
going to make much of a difference. Use it if you want to offset any
negative Z values.

You should mention contour.shp instead of just 'contour' for
<src_datasource>.

Make sure BLANK.tif doesn't have different extents/projection.

Your final image will have a data type of Float64. You may have to run some
contrast stretching operations on it.

On Tue, May 17, 2011 at 12:04 AM, Jerl Simpson <jsimpson at wxtrends.com>wrote:

> Hi guys and gals:
>
> I have something that's evading me.  I have a basic ESRI Shape file
> (created using gdal_contour) that I run through gdal_rasterize to
> generate very nice looking contour map.  But I want the value of the
> contour in there.
>
> I've been trying different things with the -a option, but I can't get
> it to work out.
> Here's the latest thing I've tried for gdal_rasterize:
>
> gdal_rasterize -a contour -3d -b 1 -b 2 -b 3 -b 4 -burn 255 -burn 255
> -burn 255 -burn 255 -burn 255 -l contour contour BLANK.tif
>
> I put an extra burn value in there (have also tried with out) to see
> if maybe it was just going in as 0.  BLANK.tif is just a black image.
> I'm sure I'm missing something simple, just can't see it.  I thought
> the -a would burn the value of "contour" into the raster.
>
> Thanks for any guidance!!
>
> Here's the data from my shapefile:
>
> INFO: Open of `contour/'
>      using driver `ESRI Shapefile' successful.
>
> Layer name: contour
> Geometry: 3D Line String
> Feature Count: 157
> Extent: (-0.500000, -89.830132) - (359.500000, 89.144137)
> Layer SRS WKT:
> GEOGCS["GCS_WGS_1984",
>    DATUM["WGS_1984",
>        SPHEROID["WGS_1984",6378137,298.257223563]],
>    PRIMEM["Greenwich",0],
>    UNIT["Degree",0.017453292519943295]]
> ID: Integer (8.0)
> contour: Real (12.3)
> OGRFeature(contour):0
>  ID (Integer) = 0
>  contour (Real) =     1000.000
>  LINESTRING (87.765060240963862 80.0 1000,.....
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-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E
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