Future Webinars: January and February 2011

November 30, 2010

Leslie Pelch, VCGI

What Webinars would you like to see offered in January and February? If you would really like to see any of the topics below presented, let me know! If you would like to do a webinar let me know! Most of the topics below do NOT currently have presenters associated with them, so please offer to present on any of these topics (or suggest a presenter…):

  1. Historical GIS Data
  2. Historical Aerial Photos
  3. Historical Topos
  4. Sustainable Develoment Applications and/or collaborations using GIS
  5. Stream Geomorphic Data – collection and application
  6. Other ArcGIS Extensions
  7. How to create metadata to VCGI standards
  8. Status of towns parcels database
  9. Parcel data and standards
  10. ESRI Community Maps Program – ArcGIS Server
  11. Low Impact Development Analysis
  12. Enterprise GIS in VT
  13. Evolving Strategies/techniques in Web-Mapping applications
  14. Data/database management (geodatabases, SDE, etc.)
  15. Wastewater/Waste supply
  16. Municipal applications
  17. Asset Management
  18. Mobile Technology
  19. More ArcHydro
  20. GPS, CORS, real-time corrections, in field and post processing
  21. Amphibian Monitoring
  22. Public participation GIS
  23. Stream Geomorphic Assessment tool update
  24. Cartographic Tips for ArcGIS

Leave a comment or send me an email! lesliep@vcgi.org


Raster Processing in ArcGIS with Map Algebra and the Raster Calculator

November 30, 2010

The next webinar!

Jarlath O’Neil-Dunne, Geospatial Analasyt at the UVM Spatial Analysis Lab will present this free webinar.

In essence, Map Algebra is the underlying language for Spatial Analyst tools and operators. This workshop will demonstrate simple and effective techniques for processing raster datasets in ArcGIS within the Raster Calculator using Map Algebra expressions. This workshop is designed for ArcGIS users who are familiar with raster data, but don’t have much experience with either Map Algebra or the Raster Calculator. Demonstrations will be done using both ArcGIS 9.3 and ArcGIS 10, and key changes to Map Algebra and the Raster Calculator at version 10 will be covered.

Click here to register for the webinar: https://www3.gotomeeting.com/register/557515214

VCGI Cached Map Services (BETA) – New and Fixed items

November 30, 2010

Steve Sharp, VCGI

VCGI has made some changes to our Cached Map Service offering.  We’ve added a cache for Vermont’s black and white orthos in Web Mercator, which will allow you to create mashups with Bing and Google using VT’s orthos.  We also corrected the projection problem with the color Web Mercator cache (Note:  The last zoom level hasn’t been fully cached yet, but the bulk of the cache is usable).

You can find the full skinny here: http://www.vcgi.org/dataware/?page=./products/metadata/map_cache.htm

This is still a BETA offering, so please keep that in mind.  Your feedback is always welcome.

New and Updated Data at the VGIS Data Warehouse

November 30, 2010


New Data:

  •  EnvironMangareas_MAREA2006 – Green Mountain National Forest Mgt. Area boundaries – 2006                
  •  EnvironOther_BIOMASS – Algae, food waste, grasses, methane, oilseed crops, wood.        
  •  EnvironOther_GEOTHERMAL – Potential open and closed loop geothermal sites.        
  •  EnvironOther_HYDRO – Existing and potential hydro electric sites        
  •  EnvironOther_RESITES – Existing RE sites and Installers and consultants        
  •  EnvironOther_SOLAR – Potential Solar PV, SHW and Ground Mount resources        
  •  EnvironOther_WIND – Potential Residential, Small and Large Commercial Wind Areas        
  •  TransStats_HCL20032007 – High Crash Locations: 2003 – 2007                     

 Updated Data:

  •  BoundaryCounty_CNTYBNDS – Vermont county boundaries (extracted from BNDHASH)                
  •  BoundaryOther_ADMINBNDS – Admin. Bound’s created by Executive Order #7-95 (Oct 1995)                
  •  BoundaryOther_BNDHASH – Master village, town, county, RPC, and state boundary data                                                   
  •  BoundaryOther_LEPCBNDS – Local Emergency Planning Committee bnds (extract BNDHASH)                
  •  BoundaryOther_VILLAGES – Vermont village boundaries (extracted from BNDHASH)                 
  •  BoundaryRegion_RPCBNDS – Regional Planning Commissions (extracted from BNDHASH)                
  •  BoundaryState_VTBND – Vermont state boundary (extracted from BNDHASH)                
  •  BoundaryTown_TWNBNDS – Vermont town boundaries (extracted from BNDHASH)                
  •  EcologicOther_RTENATCOM – Rare, Threatened and Endangered Species & Significant Comm.                
  •  TransRoad_RDS – VTrans Road centerlines from 1:5000 orthos and GPS        
  •  TransRoad_RDSMAJ1 – Major road centerlines extracted from TransRoad_RDS                
  •  TransRoad_RDSMAJ2 – Major road centerlines extracted from TransRoad_RDS                

 Go here for the details: http://tinyurl.com/vgisdata-new

TransRoad_RDS Layer Files

November 30, 2010

Sara Moulton, GISP, VTrans

As a way to help new or casual users of TransRoad_RDS, we have developed two layer files to help jumpstart a user’s ability to meaningfully display the road centerline data.

These layer files will be included as part of the zipped Transroad_RDS data package available from VCGI.  I’ve also attached them to this email in case you have already downloaded the data before the layer files were available.

As suggested by their names, one is based on the data contained in the field AOTCLASS, and one is based on the AOTCLASS and SURFACE fields.

To incorporate them in your map:

  1. Add the unzipped TransRoad_RDS data to your ArcMap .mxd file
  2. In the table of contents, double-click the data layer to open the Layer Properties window
  3. Click on the Symbology tab
  4. Click on Import
  5. In the Import Symbology dialog box, click on the Open Folder icon
  6. Browse to where you have stored the layer files, click on one and click Add
  7. Click OK in the Import Symbology dialog box (in the Import Symbology Matching Dialog, make sure the Value Field AOTCLASS matches AOTCLASS in the drop down selectionor Value Field AOTCLASS matches AOTCLASS and SURFACE matches SURFACE)
  8. Click OK.

At this point, you should be back in the Layer Properties window with the new symbology assigned so click OK to accept the symbology and return to the map.

If you have any questions about Transroad_RDS or these layer files, please contact us in the Mapping Unit: 802-828-2109 or sara.moulton@state.vt.us

Designing Maps for the Color Blind

November 2, 2010

 Jeff Nugent, Windham Regional Commission (reprint from a 2003 VGIS News)

At first, the map request from the Wilmington Planning Commission seemed challenging enough:  create a map that would clearly show all six different land use districts, two additional overlay districts, source protection areas, deer wintering areas, wetlands, floodplains, scenic roads, contours, and so on. 

Designing a single map that displays all these features with distinctly different symbols and colors is not a simple task.  Then the planning commission added one more requirement: make the map so that one of their members, who is color blind, could read it.   Designing this map now seemed all but impossible.

About five percent of people have some sort of color vision deficiency, and ten percent of all males are at least partially color blind.  Most color blindness results in a person’s inability to distinguish between some shades and red and green.  If you’re a GIS person, chances are at some point you have made a map that someone had trouble reading. 

The Color Brewer web site (www.colorbrewer.org) offers color schemes that are distinguishable by a person who is color blind.  According to the web site, “ColorBrewer is an online tool designed to help people select good color schemes for maps and other graphics.” 

At ColorBrewer, you can test all sorts of color schemes using hypothetical data and see how they would look on a map.  The site developers have created schemes that are “friendly” to color blind people, photocopiers, LCD projectors, and more. 

Color schemes with up to nine legend classes (i.e. nine different colors) can be tested.  The fewer the number of legend classes, the more color blind friendly schemes are available. Hue, saturation, and value figures for each color in the scheme are provided, and these numbers can be used in ArcView 3.x’s legend editor to reproduce the colors (click on the ‘custom’ button in the color palette window where these values can be entered).

The Vischeck website (www.Vischeck.com) provides some background information about color blindness.  Perhaps more importantly, however, the site offers a utility where you can load an image file (such as one of a map you’ve produced) and Vischeck simulates what your image would look like to a color blind person. 

Armed with these two tools, I set out to produce a map that would prove to useful in conveying information to all members of the planning commission.  I first developed a legend for my map using a color scheme from ColorBrewer.  I then created a JPEG image file of the legend and ran it through Vischeck (small files sizes work best in Vischeck; hence the JPEG of the map legend and not of the entire map itself). 

Oddly, the results from Vischeck showed several of the ColorBrewer colors, particularly the red and green, would appear similar to a color blind person.  Plus the map, to my non-color deficient eyes at least, wasn’t the most visually appealing piece of cartography; the colors were simply too stark.

To correct these shortcomings, I went through several iterations of tweaking the ColorBrewer scheme and running it through Vischeck.  Omitting several of the confusing colors (retaining the softer colors that looked good together) and instead employing some cross-hatch patterns for a few of the features also helped.  The goal was to make the colors more visually appealing to people without color blindness and at the same time more distinguishable to a person with color blindness. 

For a final check, I ran a JPEG image file of a small portion of the actual map through Vischeck.  In the end, I was able to produce a map that didn’t make me nauseous, had distinguishable colors and symbols according to Vischeck, and was “perfect” according to the planning commission member with color blindness.

Editing Data with ArcGIS 10: Desktop, Server, and Mobile – Webinar

November 1, 2010


Date/Time: November 16, 2010, 1:15 PM – 2:15 PM

Presenter: Mark Scott, ESRI

Description: Spatial data editing has never been easier, or more flexible, than it is at ArcGIS 10. ArcGIS Desktop features a new template-based editing environment to streamline workflows. New edit tools, procedures, and geoprocessing capabilities will be showcased, as well as a new method of storing and editing land parcel data. Demonstration and discussion as to how ArcGIS Mobile and ArcGIS Server applications can also use the new editing templates to edit spatial data will also be covered.

Level: Intermediate

Click here to register:  https://www3.gotomeeting.com/register/805328214