[gdal-dev] Labeling rasters

[Jerl Simpson]

I already have the resultant image, it looks great.   Just drawing
lines on a map.  I'm using a blank image so I can more clearly see
what's going on.  It's just a black and white image, and that's all I
want.
I'm trying to get the contour labeled, so I know which one I'm
viewing.  So on the 1000 contour, I should see 1000 on the line
somewhere, and if it's a 547 contour, I should see 547 on the line
somewhere.

Is that possible?

Thanks,

Jerl

On Mon, May 16, 2011 at 2:41 PM, Chaitanya kumar CH
<chaitanya.ch at gmail.com> wrote:
> 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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>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
>
> --
> Best regards,
> Chaitanya kumar CH.
> /tʃaɪθənjə/ /kʊmɑr/
> +91-9494447584
> 17.2416N 80.1426E
>



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