Yeah I also saw that. So I guess value_<band number 0 based> should do
it.
I'm working with netcdf so I wondered if that has something to do with
it. So I tried with a geotiff. Also not working. Then I updated my
mapserver to 8.0.1 from 7.4 something, and now I get the expected style
for both geotiff and netcdf.
So version do matter!
Thank you for your patience Seth!
Trygve Aspenes
Den 2023-08-28 16:07, skrev Seth G:
A good question and it doesn't seem to be clearly documented.
I've always tried values listed at
https://mapserver.org/el/input/raster.html#raster-query even though
that section appears to be written for MapScript.
Each band has a value based on index, so you should get results using
"value_0", "value_1", and "value_2" in RANGEITEM.
gdalinfo should peobably provide details on the value ranges in each
band.
Seth
--
web:https://geographika.net & https://mapserverstudio.net
twitter: @geographika
On Mon, Aug 28, 2023, at 2:50 PM, Trygve Aspenes via MapServer-users
wrote:
Thanks Seth for your quick reply
Yes I have multiple bands. gdalinfo tells me I have bands like this:
Band 1 Block=949x1069 Type=Float32, ColorInterp=Undefined
Band 2 Block=949x1069 Type=Float32, ColorInterp=Undefined
Band 3 Block=949x1069 Type=Float32, ColorInterp=Undefined
.
.
.
Band n Block=949x1069 Type=Float32, ColorInterp=Undefined
So, how could I figure out how the various bands are named in
mapserver
for the RANGEITEM?
I have looked at the documentation for STYLE/RANGEITEM but I still
don't
get it.
I have tried various values for RANGEITEM ( like "value_0", "0", "1",
"pixel", "Band 1" etc), but I dont get it.
It must be something that I'm missing.
By the way, thanks for the mapserverstudio link. Most helpful!
Trygve Aspenes
Den 2023-08-28 13:14, skrev Seth G:
Hi Trygve,
You can have multiple start/stop values and your syntax looks
correct.
Maybe you have multiple bands in your raster and you are symbolising
on
the incorrect value? Try explicitly setting the RANGEITEM.
See working example at https://app.mapserverstudio.net/#9JBVADFh
CLASS
NAME "colorramp"
STYLE
COLORRANGE "#e3edfc" "#287593" # a color gradient
from
light grey to a shade of blue
# a pixel value of -20 will be light grey, and values
from -20 to 0 will be
# assigned a color from the colour gradient of light
grey to blue
DATARANGE -20 0
RANGEITEM "value_0" # this is the name of the value
band in the raster, the datasets used in the Mapfile have a single
band
END
STYLE
COLORRANGE "#29497b" "#759387"
DATARANGE 0 20
RANGEITEM "value_0"
END
STYLE
COLORRANGE "#bfa96d" "#480d26"
DATARANGE 20 50
RANGEITEM "value_0"
END
END
Seth
--
web:https://geographika.net & https://mapserverstudio.net
twitter: @geographika
On Mon, Aug 28, 2023, at 12:06 PM, Trygve Aspenes via MapServer-users
wrote:
Hi all
I'm looking into creating a styling for a raster of float32 data.
The data describes temperature in kelvin and I want to have a
colorrange
from blue to white for data up to 273 deg kelvin(0 deg C). And from
white to red for warmer data.
I see here
https://mapserver.org/output/kerneldensity.html#raster-color-ramping
how
this is used for heatmap hoping that this will work for a raster
also.
I try with something like this:
CLASS
STYLE
COLORRANGE "#0000ffff" "#ffffffff"
DATARANGE 200 273
END # STYLE
STYLE
COLORRANGE "#ffffffff" "#ff0000ff"
DATARANGE 273 315
END # STYLE
END # CLASS
but as far as I can see this gives me only white.
If I try to use one style like this:
CLASS
STYLE
COLORRANGE "#0000ffff" "#ff0000ff"
DATARANGE 200 315
END # STYLE
END # CLASS
it works but the color range goes directly from red to blue.
Am I doing something wrong or can I not use multiple stops for these
kind of data?
Trygve Aspenes
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