• Data

    Initial Release: Statewide Aerials; Fall 2018, Winter 2018/19, and Spring 2019

    The Rhode Island Department of Transportation has contributed three new statewide aerial imagery collections to RIGIS! All imagery are 3-band, true color, with a spectacular 3-inch spatial resolution. They consist of: Fall 2018 Leaf-on Capture date range: October 14 – November 8, 2018 Winter 2018/19 Leaf-off Capture date range: November 24, 2018 – January 15, 2019 Spring 2019 Leaf-off Capture date range: April 24 – May 7, 2019 They are currently accessible via both ArcGIS image services and hosted ArcGIS Online tile layers via the URLs listed above. Traditional file download for these image collections is expected to be made available in Fall 2019, after a new web server is…

  • General Info

    Important Security Update

    PRIORITY:  TLS 1.2 security implementation will be enabled April 16, 2019. From Esri Technical Support: As part of improving ArcGIS Online security, Esri will require TLS 1.2 connections for ArcGIS Online services starting on April 16, 2019. Esri software that connects to ArcGIS Online will be affected by this change. To ensure continued access to ArcGIS Online services, you must take action prior to the implementation of TLS 1.2. Important Information from Esri: Esri Software Products Affected by TLS 1.2 Implementation Important Updates for the ArcGIS Platform and Transport Layer Security (TLS) Protocol Support

  • 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…

  • 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…