[gdal-dev] Labeling rasters

[Hernán De Angelis]

Generic Mapping Tools (http://gmt.soest.hawaii.edu/)

H.


2011/5/16 Jerl Simpson <jsimpson at wxtrends.com>:
> 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,.....
>>> >> _______________________________________________
>>> >> gdal-dev mailing list
>>> >> 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
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> 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.
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