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Importing Raster Data

MichaelGibson2

I am surprised to find that ArcGIS runtime only supports a very limited set of raster formats: Add raster data—ArcGIS Runtime SDK for .NET | ArcGIS for Developers

Supported raster formats
ArcGIS Runtime supports a subset of raster file formats that ArcGIS Desktop supports. The raster file formats ArcGIS Runtime supports include the following:
ASRP/USRP
CRF
DTED0, 1, 2
GeoTIFF
HFA
HRE
IMG
JPEG
JPEG 2000
MrSID, generations 2, 3, and 4
NITF
PNG
RPF (CIB)
RPF (CADRG)
SRTM1, 2
Mobile mosaic datasets

I'm trying to import an ASCII grid format Esri ASCII raster format—Help | Documentation

Which is basically an ascii text file, which looks like:

NCOLS xyz NROWS xyz XLLCENTER xyz YLLCENTER xyz CELLSIZE xyz NODATA_VALUE xyz row 1 row 2 ... row n

Having a brief look around, I find only a few threads of help. :Importing ASCII raster files

04-Nov-2016 07:32
Hi,

In the current v10.2.X release we don't have a specific raster data type or layer to handle these, you'll need to use the Local Server and a Geoprocessing Package to convert the ASCII raster into another raster format and then use the result map service to render that. In the upcoming v100.0 release we have added a raster layer which can reference raster files on disk. Here's the list of supported types: Add raster data—ArcGIS Runtime SDK for .NET (Quartz Beta) | ArcGIS for Developers.

If your app regularly has data coming in in ASCII format then you can still use the LocalServer to convert to one of the supported types above.

For more info on the Local Server see Work with local services—ArcGIS Runtime SDK for .NET | ArcGIS for Developers

Which I'm a bit confused about... It is not possible to process a conversion in memory, or is the only way currently to convert the file and open the new converted file, as this would seem terribly inefficient.

Is there no way to create a raster object and pass it the memory, and use something else to actually load these files?

many thanks

Mike

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MichaelGibson2

It would appear that my work around using GDAL to convert the ASCII grid into a geoTiff has stopped working...
Upon closer inspection it appear that 100.8 stopped reading the spatial reference (projection) of my converted geoTiff. At this point I don't know if its GDAL or ArcGis Runtime, but I didn't expect either to change without updating the version.

I wonder if there are any updates in this area?

RobBever

I haven't tried it yet, but it looks like using generic raster images where you have corner data from some other source (not embedded) is doable now (in SceneView only). If you look here:

Add image overlays—ArcGIS Runtime SDK for .NET | ArcGIS for Developers

You can see that in 100.8.0 there's now ImageFrame, which takes a RuntimeImage and either an Envelope or a Polygon. So you can load your regular (non-georeferenced) image into a RuntimeImage and then put that in an ImageFrame with whatever corners you want, either as an Envelope rectangle or even a 4-point polygon. Then you can put that in an ImageOverlay and you should be all set.

I think you'd have to write your own translator from world file (or whatever source of corner data for your image) to Envelope or set of points, but I think that's a fairly standard conversion. But you should now be able to load your image with world file.

I want to do it too, and I haven't tried it yet, so let me know if it works.

MichaelGibson2

So I found a work around for the time being, whereby for loading the ASCII, I'll just use GDAL to convert it to a GeoTiff format. Although this seems terribly inefficient.

For the animation, that would be even more inefficient it would seem.

I had a quick look at the LocalServer and LocalMapService, but this would seem you need to have users install and run the separate program that is the LocalServer? Is this correct?
Is no way to pass it the data, if I've already loaded them with something else like GDAL, or lets say generated them?

many thanks

MichaelGibson2

2D initially, although its certainly interesting to consider the 3D options.

many thanks

MichaelBranscomb

Are you using the 2D MapView or 3D SceneView?

Thanks

MichaelGibson2

Thanks for your reply.

I think there will be two main questions/uses I'm thinking of: the first being that we will often need to load the ASCII formats, and the second I'm considering an animation by showing a number of raster one after another, for which I have the data in memory, and again it would seem fairly inefficient to send it to the disk only to be reloaded.

I'm currently using an encapsulated WPF form within my .NET windows forms app; which intend to migrate up to WPF at some point soon. Having a bit of look around ArcGIS Runtime Local Servers, and LacalMapServices, and LocalGepprocessingServices doesn't look too simple; Could you give a quick example for the purpose of 1. loading an ASCII file 2. passing data?

Many Thanks

Mike

MichaelBranscomb

Hi,

The answer might depend on your workflow, or that of your users e.g. Is this a one-time import of raster data into another format or do users of your app regularly open ascii rasters from disk?

If you're building an app with WPF then you could use the ArcGIS Runtime Local Server. This will support all the raster formats of ArcGIS Pro / ArcMap. You could read/render the dataset from disk via a LocalMapService or use a LocalGeoprocessingService to import/convert the raster data between formats.

Thanks

Mike

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