Lecture Slides on Raster Data Structures | GEOG 476, Lab Reports of Geography

Download Lecture Slides on Raster Data Structures | GEOG 476 and more Lab Reports Geography in PDF only on Docsity! Raster Data Structures Two common raster data are elevation and land cover. Digital Elevation Models are interpolated to a uniform grid from digitized contour maps, and land cover is derived from classification of satellite and airborne digital imagery. Digital elevation models are created nationally for the United States by the U.S. Geological Survey. Land cover (NLCD) is served nationally by the U. S. Geological Survey and locally for some states, such as the Illinois geospatial data clearinghouse Land cover data formats will vary from SDTS ArcGrid Erdas Imagine (.img) shape file tiff (geo-tiff) Raster images can be displayed in ArcGIS using either ArcMap or ArcScene SDTS format must be imported to coverage or arcgrid using ArcToolbox The other formats are supported directly without conversion Ce Et Yew Inet. Sonam Tov pp 2) #H@|s sex) Gepstatistical Analyst 7 le a | Ie Georeferencing + Layer [demutm | a | Spatial Analyst ¥ Layer: |dem_utm Qin @es f (ay Uo Ue |G) ‘fa a & Layers a dem_utm Value High : 2556,000000 i Low: 411.000000 Display [Source] @n)e | praving + k@|O+ A> 2 | [ora xjfo = Br ul|A~ Select the extensions you want to use. ArcPress ArcSean Geostatistical Analyst Publisher Spatial Analyst SteetMap Europe SteetMap USA Survey Analyst Tracking Analyst Description 3D Analyst 8.3 (e] ESRI 1998-2002 About Extensions 4] Prowides tools for surface modeling and 3D visualization. Close | (be0945.57 3943632.32 Meters yi aD Sy =I) xy | Elle Edit |View Insert Selection Tools Window Help | Dy pat Data wiew ) ____~ L& Layout View | Gegstatist ee Zoom Data | Georefere Zoom Layout Bookmarks || st | el Fa | Spatial an |a@ [E Table OF Contents | li Ia [v Status Bar Overflow Labels Identy Resuks fam Scrollbars Eg aulers CHF Guides fea) org. Data Frame Properties... » » » a Display [Source] feo) | onng & OO) Oy AY ce Axor ||H Saag» Aowaxce @ b [Main Menu [¥ Standard [¥ Tools [+ Draw ie Layout [¥ Georeferencing Utility Network Analyst | Geostatistical Analyst Editor Data Frame Tools ‘Graphics Effects Survey Editor Survey Analyst Publisher Raster Painting 3D Analyst Survey Explorer Dimensioning Route Editing Disconnected Editing Network Editing Versioning Spatial Adjustment Advanced Editing fife =] wu Ay &~ os | JI | F27.96 968,68 Unknown Units A [are | YOsosaial (Or) au.) Os) 6) 32) Os) ali. GOHACSVS mm Use Spatial Analyst to create a slope map from the DEM Click on Spatial Analyst Click on Surface Analysis Click on Slope MRL LSE 21 File Edit View Insert Selection Tools Window Help SHS) SOX|ool¢fan Jz Geostatistical Analyst + | [a | | Georeferencing > | Layer [ening ow] GD | 1a | Spatial Analyst + Laper: | dem. ing + iB i CEO @eEDER OMS Z| [qh (ap fr00% = | cia 1 (ia [ed | G2) | <VALUE MO - 2.959085166 I 2.959085167 - 8.070: (i 8.070232273 - 14.257 (i 14.25741036 - 20.178 (1 20.17558069 - 25.55¢ (i 25.55573554 - 30.66¢ I 20.66689264 - 35.77¢ I 25.77802975 - 41.96¢ I 41.96520783 - 68.86¢ 5 dem.img Value High : 3362 i Low: -85 ce | ‘vey [xe] faojaa Ls low ~ RO Ov Ave pe afew wae Or de oe | Meoste.24 so0esra.c0Meters| ~=~=~SOSC~*~S~S*S~S Slope is an important ecological variable as well as a variable often used in physical models, such as stream flow and erosion. It can also be used in other models, such as solar insolation interception, avalanche prediction, and hydrology/fluvial processes. Slope can range from -1 degrees (flat) to 90 degrees (steep)!! The angle of repose is about 35 degrees Associated with slope is the 2nd derivative of elevation, referred to as aspect Aspect is the direction a slope faces Aspect can range from -1 flat 90 degrees (east) 180 degrees (south) 270 degrees (west) Aspect is declared as float or decimal data type Leave the Output raster as Temporary, don’t save it in your own folder. Petite eer ete 12) x) | File Edit View Selection Tools 4window Help | [Osea thax + Badly |\ov+QeaeQGqunoet hoa | 3D Analyst | Laver: [dem ing + iB *. ————————_ jr & scene layers q Walue High : 3362 i Low : -85 Change the band combination to 4, 3, 2 under the RGB Composite. med General | Source | Extent | Display | Symbology Base Heights | Rendering | 2x! Height © Use a constant value or expression to set heights for layer: 0 © Obtain heights for layer from surface: ial 5:45 pring-2005',G e0g476\hellungslab?slab?_files\dem.img Raster Resolution... | © (aver features have Z values, Use them for heights. Le | ~ 2 Unit Conversion Apply conversion factor to place heights in same units as scene: j custom * | j 71.0000 7 Offset Add an offset using 4 constant or expression: oO = laa al Ok Cancel Apply led - ArcScene - ArcInfo File Edit View Selection Tools 4window Help Cea St BX | +) | a sn SrQGAeQQuuerr oa 3D Analyst | Laver: [dem ing + iB *. | ©] M landsat_tm.img RGB Composite [Red: Layer_4 Green: Layer_3 [ibue: Layer_2 5 dem img Walue High : 3362 il Low : -85  Eitan Renee es i -|2) x| | File Edit View Selection Tools Window Help | |\OeOS t Bex +] | a sn |\o+QeasG@aqunuoet hoa | ap analyst | Layer [demimg ‘ip An Ae = M4 landsat_tm.ing RGB Composite [Red: Layer_4 [i Green: Layer_s [ibue: Layer_2 SM dem.ima Walue High ; 3362 il Low : -85 Display [Source] 3D Analyst Layer List Control Add the theme streams from the Mojave folder Double-click streams Click on Base Heights tab Click Obtain heights for layer from surface Is this a complete map of streams? February 2005…. Entire town evacuated…. Does there seem to be a pattern here??? La Conchita, California- a small seaside community along Highway 101 south of Santa Barbara. This landslide and debris flow occurred in the spring of 1995. Many people were evacuated because of the slide and the houses nearest the slide were completely destroyed. Fortunately, no one was killed or injured. Photograph by R.L. Schuster, U.S. Geological Survey. Now, what if you wanted digital elevation data and other raster geospatial data for a different area, where would you find it? oe eer ema ec File Edt View Favorites Toole Heb Qe. - x) (2) search Sly Favortes - 1-(J@ x ity fosemlese seer gov ebstojceanleervower.thp Au ETT ere ag lela Back to Main Page Secon ean os ae an an oes ction caa be downloaded or ordered on cero cence aireoac ly The Pez venbine Palms data ran Erelos ern tien) Nn {i ares eit See  ack ~ me search oily Favorter ity fosemles sear. gov ebstojceanleervower.hp 4a TET eer eam lela site ace Z Tel (Secettean: eae ee ie See eee ees ecco ceetteeany api =115,99, 4.08 ~ Image: 767 , 651 ~ SealeFactor: 0.0 The Pez Senta ATnsntine Pain| Faverites Tools ob »] [2 } seach ofp Favorites re} don} =20.c1.usgs. govjWabate/distrecjRequestsurma y jpp?AL94 16456967020066,04,00050309159060,-115,90471692745 ution System SDDS Request Summary Page Modify Data Request faa Preisarrr cr eearrers Femina ete eR eee | U.S. Department of the Interior || US. Ceowgica! Suney || EROS Dete Center UPL: hitg:Heaen2ha23.0x.uaga. gow Webeiteldistrec/NequestOummary.jap Maintainerwepmepoina@uegs gev || Commerta and Suggestions Last Modified: Wed 01 Decernber 2004 ee Dore @ internet  Seamless Data Distribution System SDDS Request Summary Page Prernecre Err riences US. Departmen! of tha Iaterio: || US. Geological Suney || EROS Data Conte: Raster Extract has completed. This window can be closed after saving the file. Us, aia Center ar eae ESD sep Maint Last| De.you want to open or save this he? Prval 2) Name: $3203032.2i9 Type. Winzip Fle, SC1 KB Front extract cr.ssos.oa¥ mays ack before cpening this type of fe é @ nternet UPL: hite:Hedev2ks23. cr usgs. gow Website/distreg RequestSummaty.jgp Maintainer sebmapoing@usgs.gev || Comments and Suggestions Last Modified: Wed 01 Dacerber 2004 Pmvacy Statement || Disclaimer | FOIA || Accessibilty fee