Re: [mapserver-users] kml superoverlays

[Jeff McKenna]

On 2016-01-14 6:55 PM, Even Rouault wrote:

Le jeudi 14 janvier 2016 23:21:30, Jeff McKenna a écrit :

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:

Hum I didn't try with MapServer, but looking at the GDAL request it does in the 
logs, I tried
something close with gdal_translate:

gdal_translate 
/vsicurl/http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-doqq.kml 
out2.tif -outsize 312 300

and the good or bad news is that fails on both Ubuntu and Windows (well at 
least on wine/Linux) with
a similar error to yours:

VSICURL: Start download for 
http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/422.kml
VSICURL: Stop download for 
http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/422.kml
VSICURL: Start download for 
http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/422.JPEG
VSICURL: Stop download for 
http://mw1.google.com/mw-earth-vectordb/kml-samples/mv-070501/422.JPEG
GDAL: GDALOpen(/vsimem/kmlsuperoverlay/6_0x1d0f878, this=0x1d12bd0) succeeds as 
JPEG.
GDAL: GDALDefaultOverviews::OverviewScan()
GDAL: GDALDefaultOverviews::OverviewScan()
ERROR 5: /vsimem/kmlsuperoverlay/3_0x1cf4ce8, band 1: Illegal nBlockXOff value 
(2) in GDALRasterBand::TryGetLockedBlockRef()

ERROR 5: /vsimem/kmlsuperoverlay/3_0x1cf4ce8, band 1: Illegal nBlockXOff value 
(2) in GDALRasterBand::GetLockedBlockRef()


Not sure why you get different results.

Mind opening a GDAL ticket about that ? I'm debugging something else tricky 
right now ;-)

no problem, willdo, I know the feeling :)

-jeff

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

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