High–Resolution Color Orthophotographs

Helena (2004)

April 24, 2004

Imagery provided by the City of Helena – Lewis & Clark County GIS Center

A georeferenced, ortho–rectified aerial photograph of each of the 100 areas shown on the image below is available as a MrSID image. To download an image, right–click on it and use your browser's "Save Target As" function. You may also use the same method to download three MrSID images that cover the entire area:
West (columns a–d, 608 megabytes)
Northeast (rows 1–5, columns d–j, 498 megabytes)
Southeast (rows 5–10, columns d–j, 607 megabytes)

The images have a horizontal resolution of one foot and are in Montana State Plane Coordinates, NAD83, units meters. Each image is approximately 16 megabytes. Users of ArcMap software will need ESRI .aux files to accompany each image so that ArcMap will understand their coordinate system, or "spatial reference." Users of some software may need .sdw world files to accompany each image to view these images in their correct geographic locations.