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Watersheds of Lewis and Clark

by: Domingo Cruickshank

Watersheds of Lewis and Clark EVSC 3880

Marketplace > University of Virginia > Environmental Science > EVSC 3880 > Watersheds of Lewis and Clark
Domingo Cruickshank
GPA 3.81


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About this Document

Class Notes
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This 16 page Class Notes was uploaded by Domingo Cruickshank on Monday September 21, 2015. The Class Notes belongs to EVSC 3880 at University of Virginia taught by Staff in Fall. Since its upload, it has received 16 views. For similar materials see /class/209786/evsc-3880-university-of-virginia in Environmental Science at University of Virginia.

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Date Created: 09/21/15
What is the Scholars Lab The Scholars Lab is a joint venture between the University Library and Information Technology amp Communication ITC UVa Library Digital Research amp Instructional Support DRIS ITC Research Computing Support RCS SCHOlARS39 AB What is GIS Geographic Information Systems lth Elm Collection of 7 q quot4h Raust mw hardware software his a data and people that 7 7 quot alluding are brought together in order to analyze things events and behaviors in geographic space Types of Geographic Data Raster Vector Types of Geographic Data Vector W Types of Geographic Data Raster Collection of cells or pixels each with a specific value Jg zw Eh f e va ons 720 720 11 ChpmgshSD J Chpmesha J Chp 1239 J Chpdem J Chpmask W I Nu Data 11 3nua7c7w J NevvmeshSEl shp J DEmSEIft J NbrMEan qubrN J Auswesmem J LmeshSD J Wshed shp J MESHSD shp J A Watershed m J F uWAccumMaUE mm WWW LI 740 720 700 680 Contours 7 740 720 700 680 The Pit Removal Problem Depressionless DEM Q Fill a DEM creation results in artificial pits in the landscape A pit is a set of one or more cells which has no downstream cells around it Unless these pits are removed they become sinks and isolate portions of the watershed Pit removal is first thing done with a DEM o o o Flow Direction Grid 16 4 32 61 128 164 gt 1 2 128 1 l l ll gtll gtl gtl Flow Direction Grid 32 6 4 128 I 164 l gt1 v 8 4 2 1 Wshed m J AWatershed 1 auuamm J F1uwAccumu1au 11 Fmvv 91rect1urv39 28 1 mmm 1 MeshSD 511 CI 11 Auswesmem J MeshZEIEI 511 El J Mesmuu shp Grid Network ll gtll 39 l gtlll gtlt ArcHydrO Page 71 Flow Accumulation Grid 0 0 0 0 0 0 3 2 2 0 0 0 11 0 1 0 0 1 15 0 0 2 5 24 1 Contributing Area Grid TauDEM convention The area draining each grid cell including the grid cell itself Flow Accumulation gt 5 Cell Threshold Watershed Outlet Pour Point


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