Frequently Asked Questions

Map Services

What is the difference between a map service and an image service?

If an image service has tiles, how can I use it as a dynamic image service in ArcMap?

What can I do with an image service in ArcMap?

What are the ArcGIS Server URLs used to connect to the CT ECO map and image services?

How do I connect to the CT ECO map and image services in ArcGIS Online?

What are the ArcGIS Server URLs used to connect to each CT ECO map service?

How do I connect to the CT ECO map or image services in ArcMap?

Are the CT ECO map services available in Web Map Service (WMS) format for use with GIS software other than ArcMap?

What type of orthophotography is available for Connecticut from CT ECO?


What is the difference between a map service and an image service?

A map service is the way that ArcGIS server makes maps available through the web to be used in many types of applications.

Dynamic map services have built-in capabilities where the user can change some of the layers behavior and appearance. The opposite of a dynamic map service is a cached or tiled map service. A cached map service is a faster way to serve maps on the web where users view static pictures of the map that have been pre-created. A dynamic map service has to purposefully be cached - it does not happen automatically.

An image service is the way that ArcGIS server makes pixel-based imagery available through the web for use in many types of applications. Image services support on-the-fly processing such as symbology and raster functions. Learn more here.

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If an image service has tiles, how can I use it as a dynamic image service in ArcMap?

After adding the image service to ArcMap, right-click and uncheck Enable Cache View Mode to change the image service from functioning as a cached service to a dynamic service. Click here to see what can be done with a dynamic image service. The opposite is true also (check to go from using an image service as dynamic to cached). If the Enable Cache View Mode option on the menu is grayed out, it means a cache has not been created for that image service.

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What can I do with an image service in ArcMap?

All image services, whether cached or not, have the following options found in Layer Properties:

  • Display: set contrast, brightness, transparency, display overview and tile footprints
  • Symbology: change band combinations for the 3 currently visible bands, set background values, apply stretches

Cached image services have the following capabilities that dynamic image services do not:

  • Faster drawing speed
  • Cache settings in Layer Properties

Dynamic image services have the following capabilities that cached image services do not:

  • Display: set the quality of image transmission compression (a percentage)
  • Symbology: change band combination for ALL bands, view band histograms
  • Processing Templates: ability to add functions to image service if any have been included
  • Mosaic: change the way the tiles in the mosaic overlap

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What are the ArcGIS Server URLs used to connect to the CT ECO map and image services?

There are two ArcGIS Server URLs to use, depending on the type of data you need to connect to.

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How do I connect to the CT ECO map and image services in ArcGIS Online?

To connect to the Map Services in the ArcGIS Online Map Viewer, click Add Data, choose Search for Layers

and then In: A GIS Server and under URL: type or copy/paste https://cteco.uconn.edu/ctmaps/rest/services for maps OR https://cteco.uconn.edu/ctraster/rest/services for imagery. Add the desired map services from the list.

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How do I connect to the CT ECO map and image services in ArcMap?

1. In ArcMap, click the Add Data button. From the Look in text box at the top, click the down arrow and choose GIS Servers.

Add ArcGIS Server dialog box 1

 

2. Click on Add ArcGIS Server.

Add ArcGIS Server Dialog Box 2

 

3. Make sure that Use GIS Services is selected. Then click Next in the dialog box.

Add ArcGIS Server Wizard Dialog Box 1

Enter one of the following into Server URL:

  • https://cteco.uconn.edu/ctmaps/services (for vector-based maps)
  • https://cteco.uconn.edu/ctraster/services (for imagery)

4. Click Finish.

Add ArcGIS Server Wizard Dialog Box 2

 

5. The resulting connection that you just created should appear in the GIS Servers list.

  • Map Service Address Added

     

    6. Double click on the connection (ctmaps on cteco.uconn.edu OR ctraster on cteco.uconn.edu) to see the folders that contain available services and find a service.

    List of map services

    7. Click the Add button. Below is an example of ArcMap connected to a map service. Once a map service is added, you might need to turn on its visibility checkbox and expand the group in order to see the information and the layers it contains. Note: depending on the map service, you may need to zoom in to a more detailed scale in order to display information.

    List of Base Map Layers

    The data is already symbolized for you in these map services. You can view the data and turn individual layers on and off, but you cannot edit the data, nor can you open an attribute table for any of the data layers. You can, however, use the Identify tool and retrieve feature database information in this way.

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    Are the CT ECO map services available in Web Map Service (WMS) format for use with GIS software other than ArcMap?

    Yes. Many GIS softwares can connect to the WMS version of the CT ECO map and image services. There are two ways to find the WMS address. The easiest way is to use the REST endpoints. Follow these instructions. The other way is to build the URL. Read how here.

    1. Visit the ArcGIS Server REST endpoint page (here for vector services REST, here for image services REST)

    2. Navigate the folders and locate the desired service

    3. Find the WMS link in the upper left-hand corner

    4. The WMS link opens an xml file that contains the full link to the WMS service. Copy the link and use it in the GIS software.

    Some services also list WMTS which is a Web Map Tile Service. It behaves similar to WMS but accommodates tiled services.

     

    WMS URL

    The other way to find the WMS link is to build it. WMS links are constructed as

    https://cteco.uconn.edu/ctmaps/services/FOLDER/SERIVCE/MapServer/WmsServer?
    where FOLDER is the containing folder(s) such as Base_map and SERVICE is the same of the map service such as CT_Base_Map. For example:

    https://cteco.uconn.edu/ctmaps/services/Base_Map/CT_Base_Map/MapServer/WmsServer?

    https://cteco.uconn.edu/ctraster/services/FOLDER/SERVICE/ImageServer/WMSServer?
    where FOLDER is images and SERVICE is the name of the image service, such as NAIP_2008. For example:

    https://cteco.uconn.edu/ctraster/services/images/NAIP_2008/ImageServer/WMSServer

    Visit the map and image services page for a complete list of available services.

    WMS Link Examples:

    MapsWMS Map Service URL
    Base Map/CT Base Map

    https://cteco.uconn.edu/ctmaps/services/Base_Map/CT_Base_Map/MapServer/WmsServer?
    WMTS: https://cteco.uconn.edu/ctmaps/rest/services/Base_Map/CT_Base_Map/MapServer/WMTS?

    Bioscience/Natural Diversity
    Database Areas
    https://cteco.uconn.edu/ctmaps/services/Bioscience/Natural_Diversity_Database_Areas/MapServer/WmsServer?
    Geology/Surficial Materials https://cteco.uconn.edu/ctmaps/services/Geology/Surficial_Materials/MapServer/WmsServer?
    Open Space/Protected Open
    Space Mapping
    https://cteco.uconn.edu/ctmaps/services/Open_Space/Protected_Open_Space_Mapping/MapServer/WmsServer?
    Soils/Inland Wetland Soils https://cteco.uconn.edu/ctmaps/services/Soils/Inland_Wetland_Soils/MapServer/WmsServer?
    Watersheds/Basins https://cteco.uconn.edu/ctmaps/services/Watersheds/Basins/MapServer/WmsServer?
    ImagesWMS Map Service URL
    Ortho 1990https://cteco.uconn.edu/ctraster/services/images/Ortho_1990/ImageServer/WMSServer
    Ortho 2004 https://cteco.uconn.edu/ctraster/services/images/Ortho_2004/ImageServer/WMSServer
    Ortho 2009 CRCOG https://cteco.uconn.edu/ctraster/services/images/Ortho_2009_CRCOG/ImageServer/WMSServer
    Ortho 2010 Coast https://cteco.uconn.edu/ctraster/services/images/Ortho_2010_Coast/ImageServer/WMSServer
    Ortho 2012 WMS: https://cteco.uconn.edu/ctraster/services/images/Ortho_2012/ImageServer/WMSServer
    WMTS: https://cteco.uconn.edu/ctraster/rest/services/images/Ortho_2012/ImageServer/WMTS?
    NAIP 2016 https://cteco.uconn.edu/ctraster/services/images/NAIP_2016/ImageServer/WMSServer
    Ortho 2016https://cteco.uconn.edu/ctraster/services/images/Ortho_2016/ImageServer/WMSServer

     

    Go to the CT ECO Map and Image Services page for CT ECO Data Guides and/or GIS metadata for each CT ECO service.

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    What type of orthophotography is available for Connecticut from CT ECO?

    More than 15 datasets of orthophotography are available on CT ECO. There are many variables that make each dataset unique including:

    • year captured
    • different seasons (spring or summer)
    • different bands (black and white, true color, false color) and
    • different pixel resolutions (such as 1 meter, 1 foot and 0.25 foot)

    Photography taken during the summer is generally referred to as "leaf on" orthophotography, and photography taken during the early spring is generally referred to as "leaf off" photography. Leaf off is captured immediately after the snow cover melts and before stream levels rise and leaves blossom on the trees. It is ideal for observing features on the ground surface in developed, open or wooded areas. The leaves on trees and shrubs that would normally obstruct the view from above during the summer are largely absent in the early spring, allowing for the observation of features such as stone walls, roads, and structures in wooded areas, lawns and yards.

    Refer to Connecticut Digital Orthophotography for a list and brief description of orthophotography available from CT ECO.

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