topic Re: Novice Question: Extract topo from a .tff file to export to CAD? in Data Management Questions

Novice Question: Extract topo from a .tff file to export to CAD?

CHARLOTTEBERGES — Wed, 09 Oct 2013 19:42:19 GMT

Hello Everyone,

I am quite a novice, extreme novice in dealing with the program ArcMap.

I am a architecture student trying to export editable contours from a USGS topography .tiff map to Autocad.

The topography is of Queens, New york, however I am not sure if I need a .shp file or drg or dem map of Queens first to extract
the contours. ( I am going of tutorials). Right now, what I have is the .tiff files of a raster image of topo of Queens however, when

I try to 3D Analyst > Raster Surface > Contour, a window pops up stating I do not have license to the tools. ( I am using the 60
days free trial).

Can anyone explain to me what I am doing wrong ? or what steps to take to find this information?

[ATTACH=CONFIG]28203[/ATTACH]

Re: Novice Question: Extract topo from a .tff file to export to CAD?

JimCousins — Thu, 10 Oct 2013 13:56:47 GMT

Go to the menu "Customize>>Extensions" - is 3D Analyst checked to enable it?
Regards,
Jim

Re: Novice Question: Extract topo from a .tff file to export to CAD?

CHARLOTTEBERGES — Thu, 10 Oct 2013 15:09:37 GMT

Go to the menu "Customize>>Extensions" - is 3D Analyst checked to enable it?
Regards,
Jim

Hi Jim,

Yes the 3D analyst is checked on. However, when i try the contour option it only traces the street grid on the USGS .tiff map.

Any ideas as of why? Is the contour lines too light?

thank you

Re: Novice Question: Extract topo from a .tff file to export to CAD?

JimCousins — Thu, 10 Oct 2013 20:43:00 GMT

Let me back up after reviewing your post. What you have in the screen capture are digital topographic maps. These are pictures of topographic maps, and do not have elevation information embedded in them. In order to create surface elevation contours, you need a DEM. This can be obtained (Usually, but with the Federal Government shutdown, the site is offline) from nationalmap.gov/viewer.html
With a DEM, you can create contours at the intervals you wish.
Regards,
Jim