[gdal-dev] Labeling rasters

[Chaitanya kumar CH]

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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> >> 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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>



-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E
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