How do I create contours as polygon regions?

kbadmin — Mon, 28 Nov 2016 00:34:27 GMT

Occurrence

MapInfo Discover 32-bit's Surfaces > Grid Contouring tool produces polylines, but I want the contour ranges to be (enclosed) polygon regions.

Solution

MapInfo Discover 64-bit

The Contour Operation in the new MapInfo Pro Raster can automatically create polygon contours in one step, by setting the 'Contour Type' as 'Region':

MapInfo Discover 32-bit

One of the easiest ways to convert contours to regions in the old Surfaces module, is to generate them using different tools.

To generate regions -

1. Use Surfaces > Grid Utilities > Classify and click the Auto button. Enter the desired number of contour intervals/ranges (via the add/delete/insert rows controls) and their from/to values.

2. After the you are satisfied with the classified ranges, click Save As to create a new grid file.

Downloading and Contouring Seamless Digital Elevation Models (DEM)

Josh Knight — Mon, 12 Jul 2010 00:32:14 GMT

See the comprehensive article posted here by Jack Bernard in the MIDUGNV (Nevada MapInfo/Discover User Group) fourms.

Introductory paragraph:

"Jack Bernard
June 6, 2010

We geologists always seem to have a project that uses parts of two or even four quadrangles.Wouldn't be great to make your own quadrangle, well you can!The USGS has a free service that allows seamless data to be downloaded for any chosen area.This includes Landsat images, orthophotos, DEMs, etc.Of course the USGS data is tailored for ArcGis formats, but we MapInfo people can get the data with just a little more effort.This article will illustrate how to download DEM data and then create contours in feet using Discover.It is relatively easy process once you get it figured out!

................."

How do I digitize contours from an image?

Josh Knight — Thu, 24 Jul 2008 05:07:06 GMT

This is easily accomplished with either a mouse or a digitizing board/table.

1/. If using a digitizing board or table, connect it to the PC, and configure from within MapInfo (there are copious Help notes on doing this from within MapInfo’s help files: Help>MapInfo Professional Help Topics and Search for ‘digitize’ (US spelling)

2/. Import your image containing the contours to be digitized using Discover's Images>Rectify tool

3/. Create a new table in the same projection as this image, and ensure it has a numeric (eg Float) column called RL or elevation or similar

4/. Make this new table editable in the same mapper as your image, and digitise each contour line in turn. If digitising with a mouse, using MapInfo’s AutoNode function (press N on the keyboard) may simplyfy this process (as it auto captures nodes, rather than you having to click each node successively).

5/. As each contour line is completed, either go into the browser or use MapInfo's information button to assign the appropriate elevation value for that contour line.

6/. Save the contour table regularly.

Datamine Discover KB - Contour

How do I create contours as polygon regions?

Downloading and Contouring Seamless Digital Elevation Models (DEM)

How do I digitize contours from an image?