Process API black getting tiff data true color

Apps / Services
1

Hi guys, I’m having an issue in getting data through the process API
the issue is that I always get a black picture (no matter which format I use, png, tiff)
the weirdest thing is that if I use positive latitudes and longitudes (hemisphere North/East), it works like a charm, the moment I query a region that requires negative latitudes and/or longitudes, the black dots response comes back with status=200.

Using POSTMAN :

end point: https://services.sentinel-hub.com/api/v1/process
HEADER
Accept : image/tiff

my reques is as follow:

{
“input”: {
“bounds”: {
“properties”: {
“crs”: “http://www.opengis.net/def/crs/OGC/1.3/CRS84”
},
“bbox”: [
-31.942244,
-63.414089,
-31.424924,
-63.069441
]
},
“data”: [
{
“type”: “S2L2A”,
“dataFilter”: {
“timeRange”: {
“from”: “2019-02-23T00:00:00Z”,
“to”: “2019-02-25T00:00:00Z”
}
}
}
]
},
“output”: {
“width”: 512,
“height”: 512
}
}

the evalscript is this:

// VERSION=3
function setup() {
return {
input: [“B02”, “B03”, “B04”],
output: { bands: 3 }
}
}

function evaluatePixel(sample) {
return [2.5 * sample.B04, 2.5 * sample.B03, 2.5 * sample.B02]
}

if I use the same request with the default coordinates it works fine and i can actually download the image in TIFF format.
the original coordinates that work are:
13.822174072265625,
45.85080395917834,
14.55963134765625,
46.29191774991382

2

I am guessing that the area where you are looking for data is an ocean and therefore has none.

Try changing the order of coordinates to
-63.414089,
-31.942244,
-63.069441,
-31.424924,
(or similarly).

It should be lon,lat,lon,lat.

3

I did, I’ve tried several places and also flipping the lat,lon pair in the coordinates without success I’ve also tried polygons rather than bbox , even though in the posted example I’m using bbox

as an example:
this is a region in France(I get the proper values)
45.348645,1.666404,45.371700,1.759612
as you can see the pairs for the bbox are lat1,lon1, lat2,lon2 (same as in my example for south america)

4

Hi hbalussi,

switching a coordinate order from lat, lon to lon, lat worked for me (my request below).

A coordinate order, which should be used for a request, depends on the definition of coordinate reference system (crs), which is also sent as a parameter in a request. In your example the crs definition “http://www.opengis.net/def/crs/OGC/1.3/CRS84” is used thus coordinate order must be lon, lat. We will add a not to documentation to make this more obvious. Thank you for pointing it out.

My request:

curl -X POST \
  https://services.sentinel-hub.com/api/v1/process \
    -H 'Authorization: <your access token> \
  -F 'request={
"input": {
"bounds": {
"properties": {
"crs": "http://www.opengis.net/def/crs/OGC/1.3/CRS84"
},
"bbox": [
-63.414089,
-31.942244,
-63.069441,
-31.424924
]
},
"data": [
{
"type": "S2L2A",
"dataFilter": {
"timeRange": {
"from": "2019-02-23T00:00:00Z",
"to": "2019-02-26T00:00:00Z"
}
}
}
]
},
"output": {
"width": 512,
"height": 512
}
}
' \
  -F 'evalscript=// VERSION=3
function setup() {
return {
input: ["B02", "B03", "B04"],
output: { bands: 3 }
}
}

function evaluatePixel(sample) {
return [2.5 * sample.B04, 2.5 * sample.B03, 2.5 * sample.B02]
}'