EMIS - UN-Habitat

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Building an Environmental Management Information System catalogues, JPEG (with extension), MrSID (with extension), National Image Transfer Format (NITF) (with extension), Sun raster files,TIFF,TIFF/LZW compressed. Note: ArcView GIS does not rotate, or warp, images. If your world file has non-zero rotation terms (D and B parameters), the image may change its position relative to vector data in the same view when you zoom or pan. To register an image in ArcView 3.2 the script “register.avx” can help.This extension can be found on the <strong>EMIS</strong> CD-ROM.This extension was created to register aerial photos that are already ortho-rectified.This extension works with jpg and bmp type images, as well as with tif, bsq, bip, bil and sun image types. This extension will create a world file for an image by picking control points between the image and a projected feature theme.The first order fit can shift the image up or down and stretch the image both vertically and horizontally. Keep this in mind, because it will not “warp” or “rubber sheet” the image. 1. To use this extension place it in your ext32 directory and from the File -Extensions menu select the Image to Map World File Creator. 2. You should see a blue diamond on the Project Button Bar. Press this button to begin and you will be asked for the name of the image you want to create a World File for and the name of the Feature Theme you want to register it to. 3. On the left side of your tool bar you will see a new tool that looks like a flag. Choose this tool and with it pick Ground Control Points (GCP’s) that have the same spatial location for both the image and the feature theme,To do this, select a point on the image. Select a point on the feature theme that is the same location.This constitutes 1 GCP pair. 4. Now continue: select a point on the image, select a point on the feature theme that is the same location. 5. Continue doing this until you have at least 6 GCP pairs. For a first order fit you need a minimum of 3 pairs. However, it is recommended that you have twice the minimum, so the code is set up so that you have to pick 6 pairs. 6. Once your GCP’s are chosen minimise the two views and open the table called Ground Control Point Table. This table has 6 fields: Use Pnts You will notice every record has this field ON Input x For the image x co-ordinate Input y For the image y co-ordinate Output x For the output x co-ordinate Output y For the output y co-ordinate rms Will display the Root Mean Square for each record 134
The Toolkit: Key Steps in Building an Environmental Management Information System 7. You will notice a new button “C” on the Table Button Bar.This button will calculate the fit and rms values for your control points. Press it and then look at the rms values in the RMS field.Typing OFF in the Use Pnts field can turn off any one record that gives you a high rms value. 8. Keep calculating the rms and turning records off until you are satisfied with the total rms. Just keep in mind that you have to have 6 GCP pairs ON for it to work. 9. Once you have completed this task you should see a new button on the Button Bar that looks like a pencil and paper.This button will write the world file. Press it and you will be ask where to save the file.You should save it in the same directory as the image itself. 10. The next time you open the image and feature them into a new view, both will register correctly. Avenue Script programmers are continuously developing new scripts for georeferencing images in ArcView GIS (for example ImageWarp, Image Georeferencing, Rift).The scripts usually are in zip format and contain a text document explaining the tool and the installation procedure. Please check the ESRI homepage (http://www.esri.com/arcscripts), where you can download hundreds of scripts for free. _____________________________________________________________ Digitizing onscreen in Arcview 3.2 GIS ArcView 3.2 GIS does not allow the calibration of scanned images. However, for producing “quick and dirty” maps, a scanned map can be loaded for digitizing in ArcView GIS. 1. Activate your JPEG and/or TIFF image EXTENSION Under File> Extensions >; put a checkmark (�) on “Image Extension” 2. Open your scanned image (Select IMAGE SOURCE, instead of FEATURE SOURCE) 3. Create a NEW THEME Specify the type (POINT, LINE or POLYGON) and give it a meaningful name 4. Start digitizing on-screen. SAVE EDITS while you are digitizing to avoid loss of data in case of computer problems. 5. STOP EDITING when finished. Note: : for digitizing polygons, you can use three types of digitizing modes for: • normal polygon drawing • splitting existing polygons into smaller polygons • adding new polygons to existing polygons with common boundaries 135
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Sustainable Cities Programme (SCP)
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The SCP Source Book Series Building
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Introduction and Overview B5.1 Exhi
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List of Acronyms EMF Environmental
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User’s Guide Introduction and Ove
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Part A Introduction and Overview In
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Introduction and Overview with it;
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Introduction and Overview operated
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The SCP project cycle has three mai
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Supporting a new urban management a
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Introduction and Overview approach
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Introduction and Overview derived f
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The Guide: Building an Environmenta
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Part B The Guide: Building an Envir
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The seven typical EMIS maps The Gui
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Universal Transverse Mercator Syste
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How to create a Suitability Map The
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Project flyers The Guide: Building
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The Toolkit: Key Steps in Building
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1. EMIS set-up (hardware) DATA COLL
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Map 1 Building an Environmental Man
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Map 11 Building an Environmental Ma
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United Nations Human Settlements Pr
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EMIS - UN-Habitat

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