topic Re: Programmatically Access Rasters from Mosaic Dataset Image Service using Javascript API in ArcGIS JavaScript Maps SDK Questions

Programmatically Access Rasters from Mosaic Dataset Image Service using Javascript API

tigerwoulds — Fri, 30 Oct 2020 18:26:42 GMT

Let me preface this with the fact that I am not a GIS Developer, more of a GIS Analyst with minimal programming experience. I have around 150 rasters to publish that will be used in a web map. Running Federated ArcGIS Enterprise 107 and Image Server 107.

I am trying to publish these rasters so they work with an existing web map using arcgis jsapi 4.

Rather than publishing 150 individual services, I have published a mosaic dataset as a single service to my Image Server. How can I access each raster programmatically?

In ArcCatalog I can query/select rasters in a mosaic dataset by it's Name - trying to replicate this in the js api.

Are there any examples out there? I would like to access individual rasters using a unique url.

Thanks!

Re: Programmatically Access Rasters from Mosaic Dataset Image Service using Javascript API

Gianna_BBSRC — Fri, 06 Nov 2020 10:51:44 GMT

Hi there,

I've long struggled through this exact question. You can access each raster programmatically.

Have a look at this website which I created to select from 440 different rasters using two sliders (woodland planting scenario on the left and 'time from present' at the bottom) and a checkbox (selects different rasters with or without areas with deep peat soils).

Put very simply, it's done by changing the DimensionalDefinition within MosaicRule for each selection.

You can have a look at the script on github. Any specific questions, I'm happy to help.

Cheers,

Gianna

Re: Programmatically Access Rasters from Mosaic Dataset Image Service using Javascript API

JohnGrayson — Fri, 06 Nov 2020 16:23:05 GMT

Depending on the how the ImageryLayer was published, there could be several different ways to only display certain information. For your use-case, setting the definitionExpression based on the Name field should be one way. When trying to override the default settings as published by the service author, I normally clear/reset the definitionExpression and mosaicRule properties as soon as the layer is loaded, and then set these properties as needed based on the task at hand.

Re: Programmatically Access Rasters from Mosaic Dataset Image Service using Javascript API

tigerwoulds — Sat, 07 Nov 2020 22:07:05 GMT

Thanks so much! Your web map is really impressive. I think I have what I need to figure it out from here.