Opened 16 years ago
Closed 14 years ago
#2603 closed defect (worksforme)
Too many responses with raster queries
| Reported by: | mdoyle | Owned by: | warmerdam |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | WMS Server | Version: | svn-trunk (development) |
| Severity: | normal | Keywords: | raster query getfeatureinfo |
| Cc: |
Description
While testing ticket #2586 we discovered that a GetFeatureInfo query on raster data layers returns too many features per layer, regardless of the FEATURE_COUNT attribute. This is a flaw with the raster query mechanism.
Email context:
To be honest I was surprised to get 15 responses too. Actually, on review of the ticket, I see it was 16 (numbered 0 through 15), and this was with FEATURE_COUNT=2.
Tracing through the code in the debugger, I have discovered that FEATURE_COUNT is getting passed into the generic msQueryByPoint() function, but not on to the msRasterQueryByPoint(). Furthermore, the msRasterQueryByPoint() is recieving a buffer distance of "0" which it interpretes as "not set", and it uses the layer tolerances defined for the layer. So this is why we are getting a 4x4 region of pixel values.
These are both (in my opinion) bugs with the raster query mechanism.
I would encourage you to file a distinct bug on the "too many responses"
problem with raster queries and I'll look into it too.
MapFile, Raster Data and Projections
Query to reproduce error:
mapserv QUERY_STRING='map=latest.map&SERVICE=wms&VERSION=1.1.1&REQUEST=getfeatureinfo&LAYERS=rain_ann,rain_jan&QUERY_LAYERS=rain_ann,rain_jan&X=200&Y=150&INFO_FORMAT=text/plain&SRS=EPSG:4283&BBOX=144,-43,149,-40&FORMAT=image/png&WIDTH=400&HEIGHT=300&STYLES&FEATURE_COUNT=2'
Example output:
Content-type: text/plain
GetFeatureInfo results:
Layer 'rain_ann'
Feature 0:
x = '146.4625'
y = '-41.4625'
value_0 = '1116'
value_list = '1116'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 1:
x = '146.4875'
y = '-41.4625'
value_0 = '1078'
value_list = '1078'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 2:
x = '146.5125'
y = '-41.4625'
value_0 = '1077'
value_list = '1077'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 3:
x = '146.5375'
y = '-41.4625'
value_0 = '1053'
value_list = '1053'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 4:
x = '146.4625'
y = '-41.4875'
value_0 = '1115'
value_list = '1115'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 5:
x = '146.4875'
y = '-41.4875'
value_0 = '1084'
value_list = '1084'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 6:
x = '146.5125'
y = '-41.4875'
value_0 = '1072'
value_list = '1072'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 7:
x = '146.5375'
y = '-41.4875'
value_0 = '1059'
value_list = '1059'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 8:
x = '146.4625'
y = '-41.5125'
value_0 = '1113'
value_list = '1113'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 9:
x = '146.4875'
y = '-41.5125'
value_0 = '1089'
value_list = '1089'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 10:
x = '146.5125'
y = '-41.5125'
value_0 = '1069'
value_list = '1069'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 11:
x = '146.5375'
y = '-41.5125'
value_0 = '1076'
value_list = '1076'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 12:
x = '146.4625'
y = '-41.5375'
value_0 = '1126'
value_list = '1126'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 13:
x = '146.4875'
y = '-41.5375'
value_0 = '1103'
value_list = '1103'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 14:
x = '146.5125'
y = '-41.5375'
value_0 = '1075'
value_list = '1075'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Feature 15:
x = '146.5375'
y = '-41.5375'
value_0 = '1084'
value_list = '1084'
class = '1000-1200 mm'
red = '142'
green = '206'
blue = '165'
Layer 'rain_jan'
Feature 0:
x = '146.4625'
y = '-41.4625'
value_0 = '50'
value_list = '50'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 1:
x = '146.4875'
y = '-41.4625'
value_0 = '49'
value_list = '49'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 2:
x = '146.5125'
y = '-41.4625'
value_0 = '49'
value_list = '49'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 3:
x = '146.5375'
y = '-41.4625'
value_0 = '48'
value_list = '48'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 4:
x = '146.4625'
y = '-41.4875'
value_0 = '51'
value_list = '51'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Feature 5:
x = '146.4875'
y = '-41.4875'
value_0 = '50'
value_list = '50'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 6:
x = '146.5125'
y = '-41.4875'
value_0 = '49'
value_list = '49'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 7:
x = '146.5375'
y = '-41.4875'
value_0 = '49'
value_list = '49'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 8:
x = '146.4625'
y = '-41.5125'
value_0 = '52'
value_list = '52'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Feature 9:
x = '146.4875'
y = '-41.5125'
value_0 = '51'
value_list = '51'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Feature 10:
x = '146.5125'
y = '-41.5125'
value_0 = '50'
value_list = '50'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 11:
x = '146.5375'
y = '-41.5125'
value_0 = '50'
value_list = '50'
class = '25-50 mm'
red = '248'
green = '245'
blue = '174'
Feature 12:
x = '146.4625'
y = '-41.5375'
value_0 = '53'
value_list = '53'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Feature 13:
x = '146.4875'
y = '-41.5375'
value_0 = '52'
value_list = '52'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Feature 14:
x = '146.5125'
y = '-41.5375'
value_0 = '51'
value_list = '51'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Feature 15:
x = '146.5375'
y = '-41.5375'
value_0 = '51'
value_list = '51'
class = '50-100 mm'
red = '230'
green = '236'
blue = '164'
Attachments (1)
Change History (3)
comment:1 by , 16 years ago
| Component: | WMS Client → WMS Server |
|---|
comment:2 by , 14 years ago
| Resolution: | → worksforme |
|---|---|
| Status: | new → closed |
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This appears to have been corrected already. I tested with trunk and I assume it was already fixed for 5.6.x. I get:
warmerda@gdal64[263]% mapserv QUERY_STRING='map=latest.map&SERVICE=wms&VERSION=1 .1.1&REQUEST=getfeatureinfo&LAYERS=rain_ann,rain_jan&QUERY_LAYERS=rain_ann,rain_ jan&X=200&Y=150&INFO_FORMAT=text/plain&SRS=EPSG:4283&BBOX=144,-43,149,-40&FORMAT =image/png&WIDTH=400&HEIGHT=300&STYLES&FEATURE_COUNT=2' Content-type: text/plain GetFeatureInfo results: Layer 'rain_ann' Feature 0: x = '199' y = '151.25' value_0 = '1084' value_list = '1084' class = '1000-1200 mm' red = '142' green = '206' blue = '165' Feature 1: x = '201' y = '151.25' value_0 = '1072' value_list = '1072' class = '1000-1200 mm' red = '142' green = '206' blue = '165' Layer 'rain_jan' Feature 0: x = '199' y = '151.25' value_0 = '50' value_list = '50' class = '25-50 mm' red = '248' green = '245' blue = '174' Feature 1: x = '201' y = '151.25' value_0 = '49' value_list = '49' class = '25-50 mm' red = '248' green = '245' blue = '174'attaching the slightly modified data.