Thank you for your interest in our endeavor.
Wednesday, September 1, 2010
Thank you for your interest in our endeavor.
Tuesday, June 29, 2010
A big day for the DirtMap...it is complete enough to submit. In
celebration, I urged a colleague at a similar institution to help me
go live with the map.
Monday, June 28, 2010
The colorful map shows the compiled linework that we started with.
Much was extensively modified to better illustrate the array of
surficial geologic deposits. The redline map shows the final
(preliminary) result of the modification and the addition of many,
many, many additional lines. Note that we simplified the bedrock.
Thus, some of the line density decreased as well.
Friday, June 25, 2010
Thursday, June 24, 2010
Tuesday, June 22, 2010
Monday, June 7, 2010
Friday, June 4, 2010
Tuesday, June 1, 2010
The map just keeps getting better. Tying up some loose ends, dealing differently with the Muddy Creek Formation, addressing some reviewer concerns based on a much older version, etc. Presented this map at the Digital Mapping Techniques Workshop in Sacramento a couple of weeks ago. Reaction to talk and map indicates that this map was made in record time for a record bargain.
Friday, May 21, 2010
Wednesday, May 12, 2010
Yes...there are some problem areas. Relax. We know about them.
Saturday, May 8, 2010
Wednesday, May 5, 2010
Friday, April 30, 2010
Friday, April 23, 2010
developing the generalized map. The 'messy' version portends the
variety of alluvial fan deposit (mainly) that we will soon be
beginning to methodically attribute and carve-out (where
necessary) to create the finished map.
Hooray for the Nevada Digital Dirt Mapping Team!
Tuesday, April 20, 2010
Friday, April 16, 2010
Recently, we discovered an editor tracking tool that can be installed that provides records of who edited what and when. We found it quite late in the game, but now that we have had it for about 3 weeks, it provides a useful and promising perspective on the progress with the map. Each line that is touched by an individual and edited in some way (no matter how small) becomes tagged with that person's ID. Looking at the map symbolized by mappers is interesting, shows progress, and also...well...lets you hone in on potential trouble spots. Also, the fact that if an editor touches a very long line by fixing only a small segment helps motivate the individual to investigate the entirety of the line. Sweet!
The tracking tool can be downloaded from ESRI at: http://arcscripts.esri.com/details.asp?dbid=15694
Here is an example that shows the tool's results as well as some serious progress on this huge, huge, huge map. Did I mention that the map is huge?
Tuesday, March 2, 2010
The Digital Dirt Map of Clark County, Nevada is proceeding with a team of 13 now. The goal is to complete the map by May 1 (!), so the team may grow by a couple more members soon. One of the key issues that we are currently grappling with is the refinement of the bedrock-alluvium contact in areas where it is poorly expressed by existing sources. For the most part this includes areas previously mapped at only 1:250,000 scale. Areas previously mapped at smaller scales (1:100,000 and 1:24,000) are far less problematic.
The slopeshade version:
Monday, February 22, 2010
Thus, we now have up to 11 contributors performing at various levels and time commitments. Currently, our main tasks are improving existing linework from compiled map sources and dealing with mapped units that are below our minimum map unit threshold. The first step in the linework improvement phase is modification/reshaping of the contact between bedrock units and surficial units. This turns out to be the easiest step for new 'recruits' to understand and master. The process is greatly enhanced by including multiple imagery types and shaded relief models as base layers which allow for different, yet complementary perspectives on the landscape. Also, running Google Earth in an adjacent monitor is also quite handy. Oh right...the G-Lab also got some sweet new Wacom digitizing tablets as well.
We are using versioned geodatabases in ArcSDE. to allow for independent and concurrent editing among all of us. This is the best scenario for a multi-mapper effort. Thanks to Abbey for managing the whole affair.
The ideal trajectory of mapping participation is as follows:
1. Contact between bedrock and surficial deposits (currently underway)
2. Contact between different master classes of surficial deposits (e.g., alluvial fans from playas, etc.)
3. Contact within master classes of surficial deposits (e.g., alluvial fan deposits of different ages)
Progression through these steps will depend in large part on performance and time available to map. Most team members have been assigned a 15' by 15' (minutes of lat and long) cell in which to work on the bedrock contact. They are tracking their time. Every cell will be evaluated for consistency and accuracy by the team leaders.
To date, I have spent several hours providing tutorials about the most efficient ways to carry out the bedrock / non-bedrock contact and will spend some more time this week to make sure everyone is up to speed. Also, several times in the last few months I have been able to provide some instuction / explanation in the field about the nature of the deposits we are mapping.
Monday, February 8, 2010
The Clark County dirt mapping team will soon expand from 4 to 7 or 8 as we approach a key deadline. The morass of linework remains a major issue, but we are slowly refining it into a clean data set. Here, I thought I would take a step back and evaluate the map on a more fundamental level...that of key mappable unit types. Much of this map reflects the original data sources that we are refining, but it provides a very nice overview of the distribution of the key map unit types in the county. The deposits are not divided by age in this rendition...just process / deposit type.
As the full team begins to take on the county en masse, I will post updates of this particular representation as it evolves.