[GIS] Displaying raster using ArcGIS API for JavaScript

arcgis-javascript-apimap-serviceraster

It's all a proof of concept for myself and my learning but I have definitely hit a brick wall here!

Here's what I've done and can get to work.

I have written a Python script that:

  1. Sets its workspace to and SDE instance.
  2. Checks out a Spatial licencse.
  3. Queries raster layers.
  4. Takes a raster layer based on
    some string match – and then adds 100 to each pixel to create an
    output raster. Raster Algebra stuff….
  5. The output raster is saved in the scratch workspace as "wibble".

Next….

I can Share As A Geoprocessing Service and it does all the same stuff and saves an output raster to the ArcGIS Servers output directory with a Scratch FGDB there and a raster called "wibble".

Next…

I want to run my Geoprocessing task from the browser using JS API and that works too, and it puts the output raster in a jobs folder – looking something like this:

d:\arcgisserver\directories\arcgisjobs\testraster_gpserver\jccffbe1165404cf4b930b971c86be46a\scratch\scratch.gdb\wibble

My code for the geoprocessor looks like:

var gp = new Geoprocessor("http://ls8-webd-w8v:6080/arcgis/rest/services/TestRaster/GPServer/TestRaster");
var params = { "inputMessage": dom.byId("testMessage").value };
        gp.submitJob(params, completeCallback, statusCallback);

So how do I now hook up my JavaScript code to get hold of this "wibble" raster and display it on a map in the browser. Now, I know you are not able to directly draw out rasters to a map service, it has to be an image, so you use getResultImageLayer from the geoprocessing object, but it still doesn't display, I think the code is wrong:

function completeCallback(jobInfo) {
    imageParams = new ImageParameters();
    imageParams.imageSpatialReference = map.spatialReference;
    gp.getResultImageLayer(jobInfo.jobId, "wibble", imageParams, function (gpLayer) {
        gpLayer.setOpacity(0.5);
        map.addLayer(gpLayer);
    });
}

I'm not even doing anything with ImageParameters – as I'm not sure what to do. Then I tried a different way, still nothing.

function completeCallback(jobInfo) {
    mapserviceurl = "http://ls8-webd-w8v:6080/arcgis/rest/services/TestRaster/GPServer/TestRaster/jobs";
    var mapurl = mapserviceurl + "/" + jobinfo.jobId;

    var outputLayer = new ArcGISDynamicMapServiceLayer(mapurl, {
        "id": "TestRaster",
        "opacity": 0.7
    });

    map.addLayer(outputLayer);
};

Oh, by the way – here is the python that makes the geoprocessing script – it's nothing major!

import arcpy, os, sys
from arcpy.sa import *

inputSde = r"Database Connections\ls8-dbd-w8v-2_geodb_GEOLOGY.sde"
arcpy.env.overwriteOutput = True

inputString = arcpy.GetParameterAsText(0)

def main():
    try:
        if arcpy.CheckExtension("Spatial") == "Available":         
            arcpy.CheckOutExtension("Spatial")
        else:
            raise LicenseError

        arcpy.env.workspace = inputSde
        outRas = None

        rastersStrings = arcpy.ListRasters("*", "All");

        for strRaster in rastersStrings:
            if strRaster == "GEOLOGY.MAAS_BATHYMETRY":
                path = os.path.join(inputSde, strRaster)
                raster = Raster(path)
                outRas = raster + 100
                if outRas is not None:
                    tempFile = os.path.join(arcpy.env.scratchGDB, "wibble")
                    outRas.save(tempFile)
                else:
                    arcpy.AddWarning("Failed to make raster")

    except LicenseError:
        print "Spatial license is unavailable"  
    except:
         arcpy.AddWarning("Error: {0}".format(sys.exc_info()[0]))
    finally:
        arcpy.CheckInExtension("Spatial")

if __name__ == '__main__':
    main()

I get the following Javascript error message for using the ImageParameters code (as above) – saying its "400 a bad request" – it looks like its looking in a folder "results" but I don't have that on the server – could it be to do with how I am saving the raster in the Python script? 

http://ls8-webd-w8v:6080/arcgis/rest/services/TestRaster/GPServer/TestRaster/jobs/j7613d1e015a74976986c6f7447ea5ba5/results/wibble?dpi=96&transparent=true&format=png8&imageSR=4326&f=image&bbox=%7B%22xmin%22%3A-220.57570097228788%2C%22ymin%22%3A-48.21623734392513%2C%22xmax%22%3A220.57570130793587%2C%22ymax%22%3A135.59684693950146%2C%22spatialReference%22%3A%7B%22wkid%22%3A4326%2C%22latestWkid%22%3A4326%7D%7D&bboxSR=4326&size=960%2C400

Best Answer

A couple of thoughts:

Related Question