Re: [mapserver-users] kml superoverlays

Thu, 14 Jan 2016 12:24:12 -0800 

On 2016-01-13 1:20 PM, Even Rouault wrote:

Le mercredi 13 janvier 2016 17:59:46, Páll Péter Hunor a écrit :

Hi,

Thanks for tip, I already have seen that option, but I have not found
any example how to use it.
Does anybody have any experience with that?


You can refer to general raster input documentation :
http://mapserver.org/input/raster.html

Check first with gdalinfo that the KML superoverlay is properly recognized. If
that works, you should also be able to open it in a desktop GIS such as QGIS.



Hunor

On 2016.01.13. 17:32, Even Rouault wrote:

Le mercredi 13 janvier 2016 17:15:12, Páll Péter Hunor a écrit :

Hi,

Does mapserver support raster layers using kml superoverlays as data
source, similar to shapefile based tileindexes?
I did not find any solution, but I still might exist...
Thanks in advance.


GDAL supports opening kml superoverlays file as rasters (probably with
some caveats), so you can try adding DATA your.kml or your.kmz in the
mapfile.

(no docs apart mentionning it in
http://gdal.org/formats_list.html )


Regards,
Hunor
This caught my interest yesterday, so I did some testing locally with a KML superoverlay. I used the file referenced in the KML reference doc: http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml
What I found was that I have troubles getting GDAL to read this file on Windows, yet no problems with Ubuntu.
I compile GDAL from source for both Windows and Ubuntu. To be honest, at first I thought the issue must be because on Windows I was using GDAL 2.0.1, and on Ubuntu I am using GDAL-trunk; but today I did a fresh build of GDAL-trunk on Windows, and the same problem exists. I'm sharing this because I am stuck on why this occurs. Here is more details: 

Test 1: VSICURL to a remote GeoTIFF, on Windows
===============================================
gdalinfo /vsicurl/http://svn.osgeo.org/gdal/trunk/autotest/utilties/data/pyramid_shaded_ref.tif 

result: expected details on the tif extents etc.

Test 2: VSICURL to the remote KML Superoverlay, on Windows
==========================================================
gdalinfo /vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml
gdalinfo failed - unable to open '/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml'. 


Test 3: VSICURL to the remote KML Superoverlay, on Windows, with debug
======================================================================
gdalinfo --config CPL_DEBUG ON /vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml)=0 r 
esponse_code=200
VSICURL: GetFileList(/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples) VSICURL: Downloading 0-18446744073709551615 (http://mw1.google.com/mw-earth-vectordb/kml-s 
amples/mv-doqq.kml)...
VSICURL: Got response_code=206
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.hdr)=0 r 
esponse_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.HDR)=0 r 
esponse_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml.hdr)= 
0  response_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml.HDR)= 
0  response_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/MV-DOQQ.HDR)=0 r 
esponse_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.aux)=0 r 
esponse_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.AUX)=0 r 
esponse_code=404
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml.xml)= 
0  response_code=404
VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/ 
1.kml
VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/1 
.kml
VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501\ 
1.JPEG
VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501\1 
.JPEG
OGRDB2DriverOpen: pszFilename: '/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-sampl 
es/mv-doqq.kml'
gdalinfo failed - unable to open '/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-sam 
ples/mv-doqq.kml'.

Test 4: VSICURL to the remote KML Superoverlay, on Ubuntu, with debug
=====================================================================
$ gdalinfo --config CPL_DEBUG ON /vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml)=0 response_code=200 VSICURL: GetFileList(/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples) VSICURL: Downloading 0-18446744073709551615 (http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml)... 
VSICURL: Got reponse_code=206
VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.hdr)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.HDR)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml.hdr)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml.HDR)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/MV-DOQQ.HDR)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.aux)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.AUX)=0 response_code=404 VSICURL: GetFileSize(http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml.xml)=0 response_code=404 VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/1.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/1.kml VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/1.JPEG VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/1.JPEG GDAL: GDALOpen(/vsimem/kmlsuperoverlay/0_0x14862f8, this=0x149fc60) succeeds as JPEG. VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/2.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/2.kml VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/3.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/3.kml VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/4.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/4.kml VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/5.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/5.kml VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/6.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/6.kml VSICURL: Start download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/7.kml VSICURL: Stop download for http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/7.kml GDAL: GDALOpen(/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml, this=0x14a6280) succeeds as KMLSUPEROVERLAY. 
Driver: KMLSUPEROVERLAY/Kml Super Overlay
Files: /vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml 
Size is 16384, 16384
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        TOWGS84[0,0,0,0,0,0,0],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9108"]],
    AUTHORITY["EPSG","4326"]]
Origin = (-122.129312658577717,37.439803353779496)
Pixel Size = (0.000004270647777,-0.000004095141704)
Metadata:
DESCRIPTION=The original is a 7008 x 6720 DOQQ of Mountain View in 1991. (Source: 
      http://gis.ca.gov/). This is a Region NetworkLink hierarchy of 900+
      GroundOverlays each of 256 x 256 pixels arranged in a hierarchy such
that more detailed images are loaded and shown as the viewpoint nears. 
      Enable the "Boxes" NetworkLink to see a LineString for
      each Region. Tour the "Boxes" to visit each tile. Visit the
      "A" and "B" Placemarks to see multiple levels of
      hierarchy together. Use the slider on various images in the hierarchy
      to see how the resolution varies and of the entire hierarchy to see
      the imagery below. (Find the Google Campus...).

  NAME=SuperOverlay: MV DOQQ
Image Structure Metadata:
  INTERLEAVE=PIXEL
OGRCT: PROJ >= 4.8.0 features enabled
OGRCT: Source: +proj=longlat +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +no_defs
OGRCT: Target: +proj=longlat +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +no_defs
Corner Coordinates:
Upper Left  (-122.1293127,  37.4398034) (122d 7'45.53"W, 37d26'23.29"N)
Lower Left  (-122.1293127,  37.3727086) (122d 7'45.53"W, 37d22'21.75"N)
Upper Right (-122.0593424,  37.4398034) (122d 3'33.63"W, 37d26'23.29"N)
Lower Right (-122.0593424,  37.3727086) (122d 3'33.63"W, 37d22'21.75"N)
Center      (-122.0943275,  37.4062560) (122d 5'39.58"W, 37d24'22.52"N)
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256
  Mask Flags: PER_DATASET ALPHA
Overviews of mask band: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256 
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256
  Mask Flags: PER_DATASET ALPHA
Overviews of mask band: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256 
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256
  Mask Flags: PER_DATASET ALPHA
Overviews of mask band: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256 
Band 4 Block=256x256 Type=Byte, ColorInterp=Alpha
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256
GDAL: GDALClose(/vsimem/kmlsuperoverlay/0_0x14862f8, this=0x149fc60)
GDAL: GDALClose(/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml, this=0x14a6280) 

-jeff



--
Jeff McKenna
MapServer Consulting and Training Services
http://www.gatewaygeomatics.com/



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