New elevation color-relief hill shade layers.
Over the past few weeks, fellow GINA GIS analyst Mitch Slife and myself have been busy in the GIS lab cooking up something special. We have been working on creating a new set of shaded color-relief images. Inspired by an old post by Tim Sutton on linfiniti.com, we focused on a fully command line workflow for generating geospatial masterpieces without restrictive obstacles like graphical user interfaces. This fully command line approach will allow us to scale this new hill shading to a variety of other elevation datasets in our archives.
We will be following this post up with links to the new datasets in our Web Mapping Services (WMS) and catalog system so those interested can start using these hill shades in their day-to-day GIS visualization activities.
A plane creates a neat artifact in statewide orthomosaic map.
The 2010-2015 statewide orthomosaic map was created using satellite imagery, SPOT5 satellite specifically. The SPOT5 satellite has two imagery sensors, 10m resolution multispectral sensor that provides color information and a higher 2.5m panchromatic sensor that provides higher resolution detail in greyscale. These two sets of sensor data are combined to create the SDMI orthomosaic map product. Think of the two sensors as two different cameras taking pictures from the satellite in space. The images are not captured close in time but not exactly the same time. This creates a neat effect that can be seen in fast moving objects like airplanes.
The images here show the effect of having a plane being captured first by the high resolution, 2.5m, panchromatic sensor (greyscale) and then being captured by the lower resolution multispectral (color) camera. The plane has flown forward and the spacecraft has orbited farther down it’s earth orbit changing the look angle of the camera.
More details about the statewide orthomosaic map and the Alaska mapping efforts can be found at the following websites:
We have recently added USGS Historical topographic maps for the State of Alaska to our EPSCoR Web Mapping Service (WMS) at http://ogc.gina.alaska.edu/epscor . These maps provide an interesting look at how Alaska has changed over time. Questions or comments? Email us at firstname.lastname@example.org .
Today’s Image of the Day from from GeoNorth was selected from an Alaska based scene near of Kageet Point, Icy Bay Alaska.
I’m guessing the GeoNorth folks noticed this image because this is over an area they are helping us do cloud patching of the Statewide Orthomosaic. This is from our Batch 2 delivery of cloud patching.
We have recently added Russian topographic maps, covering the northern areas of Russia and some of Norway, Sweden, and Finland. Maps at 1:1m and 1:500k, with a few areas with 1:100k and 1:200k coverage. The data was processed in a fairly “rough” manner, and there are some artifacts were the map collars were not clipped correctly. We can add additional data and improve the clipping if there is interest. Please let us know if this data is of use.
The data shows up in our GINA Extras WMS, and is usable with any Web Mapping Service client. The data will work best in Alaska Albers (EPSG:3338), Web Mercator (EPSG:3587), geographic (EPSG:4326) or the EPSG:3572 though EPSG:3576 polar projections.
We plan to update our KML feed and tile endpoints to include these maps shortly.
As always, we can be reached at email@example.com for questions or problems with the services.
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