• Tips and Tricks

    Don’t Need it All? Try Filtering!

    At times you may not need to download an entire GIS dataset. For instance, the contour line datasets available from RIGIS are quite large and can be slow to draw on your screen. The RIGIS data clearinghouse gives you the option to download a portion of a dataset. You can do this by using the filter tools. Note to desktop GIS users: RIGIS datasets cannot be subset via clips, intersects, etc, via the website. However try adding these a RIGIS feature service to your next desktop GIS project, and then running these tools! You’ll be pleasantly surprised. To filter a dataset using a table on the RIGIS data clearinghouse, first head over there: http://www.rigis.org.   Find a dataset you’re interested in working with. In this case, I’ve chosen…

  • Data

    KML and RIGIS Vector Data

    Most of the vector GIS datasets (e.g. roads, land use, benchmarks, etc.) distributed by RIGIS are accessible via KML. KML is widely supported by mapping software and apps such as Google Earth and Esri ArcGIS Earth. These KML linkages are readily available from most of the RIGIS vector dataset description pages. Head over to the RIGIS data clearinghouse: http://www.rigis.org Try browsing through the different data categories, or try the search bar to find the dataset you’re interested in. In this example, we’ve searched for the keyword “911” to find the RI E911 road centerline dataset. Look for the “Download” menu on the right-hand side of the page. If you click…

  • Data

    KMZ and RIGIS Aerial Photos

    RIGIS supports the use of KMZ files to access many of its aerial photograph collections! The KMZ file format is widely supported by mapping software and apps including Google Earth and Esri ArcGIS Earth. We’ve recently updated our website to make these KMZ linkages easier to find. NOTE: Note all RIGIS image collections are currently available as KMZ. Get started by heading over to the RIGIS data clearinghouse: http://www.rigis.org Scroll down on the homepage until you find button for the RIGIS Imagery Collections.         Select the aerial photo collection you’re interested in viewing, such as these from Spring 2011.   Finally, choose the KMZ option from the list…

  • Online Resource,  Tips and Tricks

    Story Map Success

    There were several articles on effective storytelling using apps in the Summer 2018 ArcUser magazine that I found useful. I thought you might as well, here are the links: Why Governments Need to Embrace the Lost Art of Storytelling (Chris Thomas) A More Informed View of City Business (Carla Wheeler) Make Your Story Map Successful (Hannah Wilbur)

  • Tips and Tricks

    When to Choose an ArcGIS Image Service vs an ArcGIS Online Hosted Tile Layer

    The most recent RIGIS orthophotos from Spring 2018 are available as two different types of online services: two different ArcGIS image services and one ArcGIS Online hosted tile layer. Why choose one service over the other? Choose one of the ArcGIS image services if you need any of the following: Ability to zoom into map scales larger than 1:256. Highest possible print quality. Ability to change the appearance of the images, such as applying a different type of stretch or brightness values. Compatibility with open source GIS software that requires WMS or WCS protocol. Use the ArcGIS Online hosted tile layer if: You have a need for speed. The ArcGIS…

  • Data

    Spring 2018 Aerial Photos: Initial Release

    Spring 2018 aerial photographs are now available from RIGIS as ArcGIS image services and an ArcGIS Online hosted tile layer! Here’s a quick rundown: Statewide True color 3-inch pixel size Not orthorectified Collected and processed by EagleView under contract to the Rhode Island Department of Transportation (RIDOT) Contributed to RIGIS by RIDOT, in partnership with the Rhode Island Department of Environmental Management, Rhode Island Enhanced 9-1-1 Uniform Emergency Telephone System, and Rhode Island Emergency Management Agency Esri ArcGIS Server Image Services (a.k.a. “Imagery Layers” according to ArcGIS Online) directly hosted by the URI Environmental Data Center are available in two different coordinate systems. Web Mercator WGS 84 Meters:https://edc.maps.arcgis.com/home/item.html?id=7368516070e24d4d9676d3932eaa3b73 Rhode Island State Plane…

  • Tips and Tricks

    Recommended Datum Transformation to Use with RIGIS Data

    Datum transformations help you to more accurately re-project a GIS dataset from one coordinate system to another. Selecting an appropriate datum transformation is a stumbling block for many GIS users when they mashup datasets that use different coordinate systems. Esri ArcGIS Desktop and Pro software have a robust project-on-the-fly system, however it’s worth taking a look at the datum transformation method the next time you’re adding a new dataset that uses a different coordinate system than your map’s. Here at RIGIS, we’re continuing to use Esri’s “NAD_1983_To_WGS_1984_5” datum transformation when projecting data between Rhode Island State Plane NAD83 U.S. Survey Feet (EPSG 3438) and coordinate systems that use the WGS84…

  • Data

    The RI E911 Exposure Assessment

    The Rhode Island Shoreline Change Special Area Management Plan (RI Beach SAMP), a program supported by many partners accross the state, works to study and understand how RI’s coastal communities will be affected by flooding and erosion in the coming years, and to assist municipalities in planning how to protect both people and property from these changes. One of the goals of the Beach SAMP program is to generate new data that can be used by communities and individuals to plan for the future. One of their many projects is the RI e911 Exposure Assessment, which utilizes the E911 sites data published here on RIGIS. Background on the E911 Data: The e911 sites data (as well…