October 13, 2003
Marine GIS--Where Multidimensionality Presents Special Challenges
Please note that contributed articles, blog entries, and comments posted on GIScafe.com are the views and opinion of the author and do not necessarily represent the views and opinions of the management and staff of Internet Business Systems and its subsidiary web-sites.
Meeting the Challenges
An example is a USGS study out of San Francisco Bay that may indicate areas that need to be trimmed off the rock pinnacles because they pose a threat to incoming and outgoing vessels. (Source = USGS Open-File Report 01/9/2003)
can be of interest to those involved in oil drilling or seeking core samples. Much of that data can be remotely sensed using sound waves with LIDAR.
this LIDAR data in the 3D environment creates some new challenges,” said Breman. “In creating a data model structure we have approached it so in order to ingest this data you can actually have a place for not only the x and y but the z and the multiple z values, the time variables and any measures that may be important to include as well. If you think of it in letters there is x, y, z, t and m. t is for time and m is for measures which can be used for modeling.
3D visualization is very important in understanding such changes as sea level rise, one of the more significant potential results of climate change. People want to know what's going to happen with their coastlines in 50 or 75 years. If it is true--as many scientists believe -- that the sea level is going to rise in our lifetimes significantly, then planning needs to be done to prepare for this. “There are things we can do to assess whether or not there will be a need to build up or move back or create breakwalls, or propose solutions for a change of sea level,” attested Breman.
Breman concluded it is safe to speculate that sea level rise will be influenced by global climate change. “We're creating tools to be able to predict the amount of global climate change and sea level rise change more accurately. With advancements in data we're really poised to come up with some of those answers. And it's not something where I can say, 'here's the answer,' but the tools that we have available right now put us in a better position to answer some of these questions.”
climate change will affect our coasts with nearshore influences such as erosion, I just hope that we are ahead of the curve.”
In addition to the challenges presented by nature, Breman addressed the fact that over the past five years the sensors and availability of live streaming data gives us a different amount of data to work with so we're faced with a new larger volume of data--thousands of measurements (or Gigabytes of data) per hour, that create, over time, a huge challenge to work with in the computer environment. This presents new questions of how to work with that volume and type of data.
An important part of marine work is being able to measure the water column, defined as the body of water between benthic and surface. Because of its dynamic nature and because it's difficult to represent a true 3D environment, the water column has been difficult to measure. Breman is currently working on the representation display and the analytical tools which include animation tools and extrusion (the stretching of the water column) within this environment.
are very keen on
seeing the model implemented, and in publishing the results for our community of users, as well as for related communities such as our colleagues in atmospheric science and terrestrial geology.”
The current repository and geodatabase samples for the Marine Data Model are for ArcGIS 8.3. Joe Breman is doing his development work in ArcGIS 9. There are also some older geodatabases that haven't upgraded to 8.3 yet because of some backward incompatibility issues.
they're dealing with
air.” The merging of the many data model initiatives creates a mechanism to leverage progress, so we can “go deeper” in our understanding of the world we live in, and how it is changing.
Sanborn announced that the company signed an agreement with Boulder, Colorado-based Vexcel Corporation to acquire its new UltraCam-D large format aerial camera. The UltraCam-D has a base panchromatic resolution of 11,500 x 7,500 pixels, in addition to four color channels (red, green, blue and near-infrared). Imagery is collected at a depth of 12 bits per channel and a rate of more than one frame per second. Forward-motion compensation can support pixels as small as 3 cm on the ground.
Global Energy Decisions, LLC (Global Energy) announced it has acquired ENERmap -- a leading energy industry mapping and geographic data firm. ENERmap produces detailed print, electronic, and interactive maps for the electric, coal, and transportation industries. Terms of the deal were not disclosed.
You can find the full GISCafe event calendar here.
To read more news, click here.
-- Susan Smith, GISCafe.com Managing Editor.
Be the first to review this article