[mapserver-users] kml superoverlays

[Jeff McKenna]

On 2016-01-14 4:51 PM, Even Rouault wrote:
>
>> Could this 'OGRDB2DriverOpen' be the issue?
>
> This is just a harmelss debug message (that shouldn't be printed IMHO in the
> Open() method of the DB2 driver. cc'ing David)
>
>> Shouldn't GDAL use the
>> "KMLSUPEROVERLAY" driver here?  (for the record that driver is listed in
>> both my Windows and Ubuntu builds, through 'gdalinfo --formats').
>
> No the issue is that the \ windows directory separator was used instead of /
> for http ressources.
> Just fixed with https://trac.osgeo.org/gdal/ticket/6310
>
> You might get some extra open speedup by defining
> GDAL_DISABLE_READDIR_ON_OPEN=EMPTY as env. var/config. option (this prevents
> probing for (most) side-car files. This is not something to use in general
> however.
>

Thanks Even, that worked!

Now onto MapServer :)  Unfortunately that same vsicurl superoverlay in 
MapServer-master works on Ubuntu, but now on Windows.  Here is more details:

Mapfile
=======

MAP
NAME "superoverlay"
STATUS ON
SIZE 400 300
EXTENT -122.1293127 37.3727086 -122.0593424 37.4398034
UNITS DD
IMAGECOLOR 255 255 255

LAYER
   NAME "mountain-view-superoverlay"
   TYPE RASTER
   STATUS ON
   #DATA "mv-doqq.kml"
   DATA 
"/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml"
   CLASS
     NAME "Superoverlay"
     STYLE
     END
   END
END # layer

END # Map File

Test1: MapServer with superoverlay+VSICURL, on Windows
======================================================

shp2img -m superoverlay-kml.map -o ttt.png -all_debug 5

result (fail)
-------------

msLoadMap(): 0.000s
msDrawMap(): rendering using outputformat named png (AGG/PNG).
msDrawMap(): WMS/WFS set-up and query, 0.000s
msDrawRasterLayerLow(mountain-view-superoverlay): entering.
msDrawRasterLayerGDAL(): Entering transform.
msDrawRasterLayerGDAL(): src=0,0,16384,16384, dst=44,0,312,300
msDrawRasterLayerGDAL(): source raster PL (-4.888,-27.409) for dst PL 
(44,0).
msDrawRasterLayerGDAL(): red,green,blue,alpha bands = 1,2,3,4
drawGDAL(): Unable to access file. GDALDatasetRasterIO() failed: 
/vsimem/kmlsuperoverlay/3
_085CA378, band 1: Illegal nBlockXOff value (2) in 
GDALRasterBand::GetLockedBlockRef()

msDrawMap(): Image handling error. Failed to draw layer named 
'mountain-view-superoverlay'
.
msDrawMap(): Image handling error. Failed to draw layer named 
'mountain-view-superoverlay'
. <br>
drawGDAL(): Unable to access file. GDALDatasetRasterIO() failed: 
/vsimem/kmlsuperoverlay/3
_085CA378, band 1: Illegal nBlockXOff value (2) in 
GDALRasterBand::GetLockedBlockRef()
  <br>
msFreeMap(): freeing map at 061BA7F0.
freeLayer(): freeing layer at 07273208.

Test2: MapServer with superoverlay+VSICURL, on Ubuntu
======================================================

$ shp2img -m superoverlay-kml.map -o ttt.png -all_debug 5

result (success)
----------------

[Thu Jan 14 18:20:02 2016].525687 msLoadMap(): 0.000s
[Thu Jan 14 18:20:02 2016].525906 msDrawMap(): rendering using 
outputformat named png (AGG/PNG).
[Thu Jan 14 18:20:02 2016].525919 msDrawMap(): WMS/WFS set-up and query, 
0.000s
[Thu Jan 14 18:20:02 2016].527354 
msDrawRasterLayerLow(mountain-view-superoverlay): entering.
[Thu Jan 14 18:20:11 2016].774926 msDrawRasterLayerGDAL(): Entering 
transform.
[Thu Jan 14 18:20:11 2016].774950 msDrawRasterLayerGDAL(): 
src=0,0,16384,16384, dst=44,0,312,300
[Thu Jan 14 18:20:11 2016].774955 msDrawRasterLayerGDAL(): source raster 
PL (-4.888,-27.409) for dst PL (44,0).
[Thu Jan 14 18:20:11 2016].774969 msDrawRasterLayerGDAL(): 
red,green,blue,alpha bands = 1,2,3,4
[Thu Jan 14 18:20:13 2016].225477 msDrawMap(): Layer 0 
(mountain-view-superoverlay), 10.700s
[Thu Jan 14 18:20:13 2016].225507 msDrawMap(): Drawing Label Cache, 0.000s
[Thu Jan 14 18:20:13 2016].225512 msDrawMap() total time: 10.700s
[Thu Jan 14 18:20:13 2016].244934 msSaveImage(ttt.png) total time: 0.019s
[Thu Jan 14 18:20:13 2016].244971 msFreeMap(): freeing map at 0x15256f0.
[Thu Jan 14 18:20:13 2016].244994 freeLayer(): freeing layer at 0x152d120.
[Thu Jan 14 18:20:13 2016].245030 shp2img total time: 10.720s



-jeff



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