2016 Orthophotography and Lidar Download Help

 

File Formats | Spatial Reference | Download a Small Number of Files | Download Many Tiles using a Download Manager

Download a Small Number of Files

To move around the map, use the + to zoom in and the - to zoom out. Pan by holding the left-click and dragging your mouse. If you have a scroll wheel or touch pad on your mouse, scroll up to zoom in and down to zoom out. (Note that a download manager can be installed in your browser. If you plan on clicking and downloading a lot of files, consider using a manager to line the files up and download one at a time - it will help you manage it and help our server load)

To start, EITHER:

  • Select a Town from the drop-down list Town drop-downor
  • Click on the map.

Now that a town is selected (colored in yellow), click on a link to download the file. Find the links in the results window or the tile list. Result Window for a Tile

  • The Results window: On the Town tab click to download the town mosaic in either MrSID gen 3 or MrSID gen 4 format. Click the Tile tab to download the selected tile as a GeoTIFF, MrSID gen 3, MrSID gen 4 tile or a DEM (elevation).
  • The Tile List : Click on the file type to (.. you guessed it), download the zipped tile..
Tile List

 

The Tile List Column has some other nifty functions.

- The Magnifier zooms the map to that tile
- Clicking on the Town Name will zoom the map to that town and
- Clicking on the X next to the town name clears out the selected tiles.

Magnifier

 

Town Mosaics

The town mosaics are available in MrSID gen 3 or MrSID gen 4 formats. The extent of the town mosaics are defined by a rectangle that includes the town boundary. The rectangle extent was used to ensure that no part of any town would be missing. Also, image data must be a rectangular shape so instead of providing you with many black pixels that contained no information, you get a full rectangle of aerial imagery! Lucky you!

To see the extent of the town mosaic that you can download, mouse over Mosaic Extent in the Results window. The orange square outlines the rectangular extent of imagery in that town's mosaic.

Download Numerous Tiles

Visit the Download Manager page for instructions on the best way to download many tiles, which is to use a download manager. Note that the instructions include downloading individual tiles by clicking and downloading a selected list of tiles.

File Formats

Images can be downloaded in four formats. Three are imagery and one is elevation.
- are imagery files include 4 bands (red, green, blue, near-infrared)
- have 3 inch foot pixel resolution
- are delivered in a zip file that includes metadata. The file will need to be unzipped or extracted before the imagery can be accessed.
- each tile is 2500ft on a side and covers 0.224 sq miles, 0.58 sq km, 143.5 acre

File Format File Size  
MrSID Generation 3 Tiles 14.5Mb  
MrSID Generation 4 Tiles 19Mb  
GeoTIFF Tiles 381Mb Beware: at nearly 400Mb each, they take a LONG time to draw.
MrSID Generation 3 Town Mosaic   A bounding rectangle with a buffer from the town boundary.
Tip: Because the mosaic extents are a rectangle, there will be overlap when viewing multiple towns at once.
MrSID Generation 4 Town Mosaics   A bounding rectangle with a buffer from the town boundary.
Tip: Because the mosaic extents are a rectangle, there will be overlap when viewing multiple towns at once.
Digital Elevation Model (DEM) Tile