[gdal-dev] Labeling rasters

[Jerl Simpson]

Ok, thank you.

Does anyone else have any suggestions?



On Mon, May 16, 2011 at 3:06 PM, Chaitanya kumar CH
<chaitanya.ch at gmail.com> wrote:
> Jerl,
>
> I'm afraid gdal_rasterize can't do the labelling. You will need a
> specialized renderer for that. I'm not familiar with any of the desktop
> applications that do this. Perhaps, qgis has a plugin.
>
> On Tue, May 17, 2011 at 1:30 AM, Jerl Simpson <jsimpson at wxtrends.com> wrote:
>>
>> 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
>> >
>>
>>
>>
>> --
>> This communication is privileged and may contain confidential
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>> named above. If you are not the intended recipient, do not distribute
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>> error, please notify the sender immediately and return the original to
>> the email address above. © Copyright 2011 Weather Trends
>> International, Inc.
>
>
>
> --
> Best regards,
> Chaitanya kumar CH.
> /tʃaɪθənjə/ /kʊmɑr/
> +91-9494447584
> 17.2416N 80.1426E
>



-- 
This communication is privileged and may contain confidential
information.  It's intended only for the use of the person or entity
named above. If you are not the intended recipient, do not distribute
or copy this communication. If you have received this communication in
error, please notify the sender immediately and return the original to
the email address above. © Copyright 2011 Weather Trends
International, Inc.