# ArcMap

2 replies to this topic

### #1 Milena88 Posted 05 June 2012 - 05:39 AM

Milena88

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• Validated Member
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Hi all,

I need help. I worked in GeoWepp which use ArcMap for lunching simulations of erosion in streams, but before i start geowepp i must
input DEM of my study area. I watched hundreds of tutorials but all this tutorials have downloaded DEM from internet (those scientist didn't
precipitated in creating DEM), and for my study area I cannot find it so I decided to create my own DEM. My question is, can somebody tell me how can I input from my topographic map true value for example heights or values of contours if i have( again for example) 78 meters point height (above sea) on my topographic map. Can ArcMap "read" that values properly? And if i want from dem to show me stream, where and which one values i must put? How I can input for example water flow q (m3/s) or characteristic about river drift in arcmap?I input some values in attribute table but i think I'm on wrong way. Thanks.

### #2 Lego Posted 05 June 2012 - 03:41 PM

Lego

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• Location:Kampala
• Uganda

Hi all,

I need help. I worked in GeoWepp which use ArcMap for lunching simulations of erosion in streams, but before i start geowepp i must
input DEM of my study area. I watched hundreds of tutorials but all this tutorials have downloaded DEM from internet (those scientist didn't
precipitated in creating DEM), and for my study area I cannot find it so I decided to create my own DEM. My question is, can somebody tell me how can I input from my topographic map true value for example heights or values of contours if i have( again for example) 78 meters point height (above sea) on my topographic map. Can ArcMap "read" that values properly? And if i want from dem to show me stream, where and which one values i must put? How I can input for example water flow q (m3/s) or characteristic about river drift in arcmap?I input some values in attribute table but i think I'm on wrong way. Thanks.

hullo milenna,
ok firstly am not sure about what you but am thinking you need to create a dem from your topographic data. if am right, then try this procedure;
1- Open ArcMap (make sure you have the spatial analyst extension license and that it is checked in extensions)
3-check through them for the one that represents contours; it shd be a line shapefile. Open its attribute table and look for the field that represents the Z-values.
4- Run the Topo to raster tool and input the shapefile of contours (and maybe a polygon shapefile of your particular are of interest). choose the output location and raster name-press ok
5-when the tool is done running, you'll have yourself a dem. hope it works out fine. good lack

### #3 Milena88 Posted 06 June 2012 - 01:53 AM

Milena88

Newbie

• Validated Member
• 2 posts
• No Country Selected

Hi all,

I need help. I worked in GeoWepp which use ArcMap for lunching simulations of erosion in streams, but before i start geowepp i must
input DEM of my study area. I watched hundreds of tutorials but all this tutorials have downloaded DEM from internet (those scientist didn't
precipitated in creating DEM), and for my study area I cannot find it so I decided to create my own DEM. My question is, can somebody tell me how can I input from my topographic map true value for example heights or values of contours if i have( again for example) 78 meters point height (above sea) on my topographic map. Can ArcMap "read" that values properly? And if i want from dem to show me stream, where and which one values i must put? How I can input for example water flow q (m3/s) or characteristic about river drift in arcmap?I input some values in attribute table but i think I'm on wrong way. Thanks.

hullo milenna,
ok firstly am not sure about what you but am thinking you need to create a dem from your topographic data. if am right, then try this procedure;
1- Open ArcMap (make sure you have the spatial analyst extension license and that it is checked in extensions)
3-check through them for the one that represents contours; it shd be a line shapefile. Open its attribute table and look for the field that represents the Z-values.
4- Run the Topo to raster tool and input the shapefile of contours (and maybe a polygon shapefile of your particular are of interest). choose the output location and raster name-press ok
5-when the tool is done running, you'll have yourself a dem. hope it works out fine. good lack

Hi,
Thanks , yes you have been right, i want to create dem from my topo map. Ok i shall do this right now. I shall let you know if i succeed.
best regards,

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