topic Re: Contour lines created from DEM not drawing in ArcGIS Spatial Analyst Questions

Contour lines created from DEM not drawing

MShairah — Thu, 18 Aug 2022 03:31:44 GMT

Hello!

Was wondering what could be the reason as to why contours I've generated from a DEM aren't drawing. Raster details are shown below. While Arc prompted me that drawing the contours was successful, just one small contour shows up (in orange). Attribute table isn't empty either. Contour interval was set at 2m.

Re: Contour lines created from DEM not drawing

DanPatterson — Thu, 18 Aug 2022 08:16:00 GMT

Were you using

Contour (Spatial Analyst)—ArcGIS Pro | Documentation

and if so what are the tool parameters and the extent specified?

You have lots of contours, not just 1

Re: Contour lines created from DEM not drawing

MShairah — Thu, 18 Aug 2022 08:49:33 GMT

Hello Dan,

I'm using the same tool under ArcMap 10.7.1. Yes, that's what puzzles me. I have lots of contours but that one outlined in orange seems to be the only one displaying on the map.

Re: Contour lines created from DEM not drawing

JohnWatt — Mon, 22 Aug 2022 22:03:04 GMT

Hi MShairah - Try deleting the spatial index - this has solved most of my 'some features are showing but not all' errors.

Re: Contour lines created from DEM not drawing

HuaxinWang — Mon, 26 Sep 2022 07:17:35 GMT

what was the error?

I resolved my raster to contour today.

The error was 010067.

Instead of generating contour from a larger area of raster DEM,

I clip the larger one into a smaller area.

And then I generated the contour from the smaller one.

It worked.

I still don't know why.

And don't know how to merge every small contour into a larger contour.

But the smaller area contour generates, is ok.