GeoZone

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Newest “Loss Is Nothing Else But Change, and Change is Nature’s Delight.” -Marcus Aurelius

by Tuesday, January 20, 2015 @ .

When talking about land cover changes over time the terms “loss” and “change” are often used interchangeably, but they may mean quite different things. Depending on what is being mapped and the story being told, these terms need to be clarified. Change versus loss This is best highlighted by comparing maps of land cover versus land use. Land cover captures the physical state of land resources, while land use denotes how the land is being used, or planned for use (see previous blog for more info).  For example, a parcel of land may be owned, and managed, specifically for the purp

General, Land Cover

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Workaround for 16-bit Thematic Tiff in ArcGIS

by Monday, January 5, 2015 @

While working with our 16-bit land cover change data (see earlier GeoZone post) in Tiff format we noticed a problem using ArcGIS. The display doesn't color the image properly. The problem has been reported to Esri and they've entered it as a bug to fix in a future release. Until then, I thought I ought to give you a workaround or two. The Problem I'm going to use the C-CAP land cover change da

General, Land Cover

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When 50 Shades of Grey Is Not Enough, Try 625

by Wednesday, December 10, 2014 @

Q: Why is land cover change significant? A: Mapping change visualizes large-scale regional effects, either from policy and anthropogenic trends or natural environmental changes. Mapping change is harder than it sounds. First, the products for both times must be mapped with the same framework and to the same standard. Second, we differentiate areas of change from areas without change. Only the

General

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Raster Provisioning with Open Source

by Friday, November 21, 2014 @

In June of this year we had to turn off the raster provisioning software for the Digital Coast Data Access Viewer (DAV). That was the package that let us grab tiles of imagery, mosaic and reproject them, and then deliver the output to users. Unfortunately, it used Java 5 and that was considered a security hole. The company had no plans to upgrade to at least Java 7, so there was no choice but 

General, Water Quality

Looking upriver at Ruby on the Yukon River on a sunny afternoon.

Rain Gardens – Local Solutions

by Friday, October 31, 2014 @

I love the idea of rain gardens! Instead of expecting a government bureaucracy to spend my tax money to fix water quality problems, I can do something within my own yard that reduces the nutrients flowing into the watershed. So what is a rain garden? It's just an area that will hold the rain water for a few hours--allowing it to percolate into the ground--that is planted with pretty things that d

General

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Don’t Stand in the Road: The Precautionary Principle and Overcoming Uncertainty

by Tuesday, October 14, 2014 @

If I were to say you had a 100 percent chance of being hit by a car if you stood in the road for 5 minutes, would you consider it? How about a 50 percent chance? A 10 percent chance? Even a 1 percent chance? What if there was some sort of incentive, like a new car? Although this scenario may seem a bit ridiculous, it is not so different from coastal management decisions. Residents place themsel

General

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Things to Consider Before You Acquire New Imagery

by Thursday, October 9, 2014 @

Have you ever wanted to purchase new imagery (or download free imagery from a government website) of your county or municipality? Here are just a few requirements you may want to think about before writing that big check for new data. Digital orthoimagery is the foundation for most public and private Geographic Information Systems (GIS). Orthoimagery refers to aerial and satellite imagery that has

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