WCPS_Nodata value in intervals is error

[Bang Pham Huu]

Current nodata as extra parameter in WCPS works with separate values, such as:

for c in (test_mean_summer_airtemp) return encode(c[Lat(-20:-20), Long(120:121)],
 "tiff", 
"{ \"nodata\": [0, 1, 2 , 3], \"geoReference\":{\"crs\":\"EPSG:4326\"} }")

but not with intervals, such as:

for c in (test_mean_summer_airtemp) return encode(c[Lat(-20:-20), Long(120:121)], "tiff", 
"{ \"nodata\": [0:1, 1:2, 3:4], \"geoReference\":{\"crs\":\"EPSG:4326\"} }")

It needs to fix the NoData model class in Petascope to deserialize JSON input string correctly.

[Dimitar Misev]

This is not valid JSON:

\"nodata\": [0:1, 1:2, 3:4]

[Bang Pham Huu]

I discussed with Dimitar and actually the nilValues in GDAL must be separated, so if one imports coverage with a double nilValue, wcst_import will round it with floor:ceil (such as: 10.00001 to 10:11) and stored in petascopedb.

with a WCPS, nilValue is passed internally as a mandatory parameter beside CRS, e.g: nodata=[10:11] but it is not valid so Dimitar suggested:

in encode you don't specify a null value if there's something like 0:1
but if it's 0:0 you take 0

Then WCPS need to handle this case for nilValues in interval.

[Bang Pham Huu]

I managed to ingest the case in comment:3 when the nilValues are double for test_rgb with first 2 bands and an integer for the third band, the DescribeCoverage like this:

swe:field name="red">
<swe:Quantity>
<swe:nilValues>
<swe:NilValues>
<swe:nilValue reason="">-100</swe:nilValue>
<swe:nilValue reason="">-99</swe:nilValue>
</swe:NilValues>
</swe:nilValues>
<swe:uom code="10^0"/>
</swe:Quantity>
</swe:field>

<swe:field name="green">
<swe:Quantity>
<swe:nilValues>
<swe:NilValues>
<swe:nilValue reason="">20</swe:nilValue>
<swe:nilValue reason="">21</swe:nilValue>
</swe:NilValues>
</swe:nilValues>
<swe:uom code="10^0"/>
</swe:Quantity>
</swe:field>

<swe:field name="blue">
<swe:Quantity>
<swe:nilValues>
<swe:NilValues>
<swe:nilValue reason="">35</swe:nilValue>
</swe:NilValues>
</swe:nilValues>
<swe:uom code="10^0"/>
</swe:Quantity>

and Rasql from the WCPS query (for c in (test_rgb1) retur nencode(c, "png")) will have nodata with only the first value for each band from the WcpsCoverageMetadata class and getNodata method (line 152).

\"nodata\":[-100,20,35]}

so it can be closed.