One capability that is relatively new that I don't think anyone mentioned is the ability to display previously uploaded imagery and vectors: depending on your goal, using the imagery, manual location selection (which is a capability of TDS's Solo Field, but not, as far as I know, Terrasync or ArcPad), and GPS as a navigation tool can allow you to get extremely accurate positions without the need for expensive GPSs (the dataloggers need to be Windows CE, but you can use most cheapo GPS cards). We used this successfully to map individual trees in Sierra Forests by displaying Quickbird satellite data.
Particularly for high spatial resolution mapping projects, no matter how good your GPS is, if your image orthorectification is off (which it will be), it won't matter much that your point is accurate to within a millimeter. --j -- Jonathan A. Greenberg, PhD NRC Research Associate NASA Ames Research Center MS 242-4 Moffett Field, CA 94035-1000 Phone: 415-794-5043 AIM: jgrn3007 MSN: [EMAIL PROTECTED] -----Original Message----- From: Ecological Society of America: grants, jobs, news [mailto:[EMAIL PROTECTED] On Behalf Of Lichti, Nathanael I Sent: Tuesday, March 28, 2006 12:35 PM To: ECOLOG-L@LISTSERV.UMD.EDU Subject: Re: GPS units and accuracy data and more on the project... This has been a useful discussion, at least for a relative novice like = me. Can anyone recommend a good book or web page that covers base = stations, post-correction, and other GPS techniques in more detail? = Thanks, =20 Nate=20 =20 --=20 Nathan Lichti=20 Graduate Research Assistant=20 Forestry and Natural Resources=20 Purdue University=20 715 W State Street=20 West Lafayette IN 47907-2061=20 (765) 494-9597=20 [EMAIL PROTECTED] ________________________________ From: Ecological Society of America: grants, jobs, news on behalf of = Malcolm McCallum Sent: Tue 3/28/2006 3:04 PM To: ECOLOG-L@LISTSERV.UMD.EDU Subject: Re: GPS units and accuracy data and more on the project... If using WAAS real time correction, you may be able to get by without = =3D base station corrections. In the midwest there are base stations within = =3D a reasonable distance of most universities (and at most universities). = =3D20 =3D20 Malcolm L. McCallum Assistant Professor Department of Biological Sciences Texas A&M University Texarkana 2600 Robison Rd. Texarkana, TX 75501 O: 1-903-233-3134 H: 1-903-791-3843 Homepage: https://www.eagle.tamut.edu/faculty/mmccallum/index.html =3D20 ________________________________ From: Ecological Society of America: grants, jobs, news on behalf of =3D Pete Rissler Sent: Tue 3/28/2006 1:00 PM To: ECOLOG-L@LISTSERV.UMD.EDU Subject: Re: GPS units and accuracy data and more on the project... Just a simple question, will you have access to a base station to post process your data with? If not, you'll need a second unit to act as the base station. Pete
