Thanks, Jesse! Have you ever seen the TimeMap Java applet? This does almost everything I need, except for the digitizing and irregular polygon-based map queries. It uses Zoomify to cut up a large background image into a pyramid of tiles. Chenck out the JADIS TimeMap application from the GAIA Lab's web site; the URL is listed below.
Basically, what I need the users to be able to do is add/edit data to an online database, where all the attributes are stored in MySQL, and the shapes are stored in shapefiles (so that a copy of the shapefiles can be put on a GPS using ArcPad). They also need to be able to execute queries to the database by drawing an irregular region on the map, buffering it to a specified distance, and then retreiving all the records that fall into the footprint. -Steve Quoting Jesse Eichar <[EMAIL PROTECTED]>: > I'm answering in-line to each of you points. > > > > 1. Does udig support dynamic adding and dropping of image layers? I > have a > > very large area to map, which is covered by about 250 Landsat > 30-minute tiles > > in .jpg format with world files. Clearly I can't load all of these > images into > > the map at the start. I need to be able to load only the ones in the > user's > > map frame, dynamically, as a user pans or zooms. Is this possible? > > > > > Right now this is limited. You will have to just try it out to see what > > works right now. However there are 2 things that are going to happen > VERY soon. > 1. A Coverage branch in geotools is going to be merged onto trunk. > This branch will have much much improved coverage support. I believe > that > JAI is used so that very large coverages can be used without having to > > load the entire image into memory. The ETA for this is sometime this > month. > 2. I ALMOST have an OSSIM plugin that can display almost any image. It > > is really fast and has a very reasonable memory footprint. I just need > > a couple days to finish it up. However I am pretty far behind my > original schedule. I am expecting some people to be able to help out on > > that in April/May. If I haven't got it done by then. > > > 2. Does udig support digitizing over the web? I need users to be > able to draw > > points or polygons on their maps, and have the shapes saved on the > server. > > > > > You can edit WFS and PostGIS for certain. I am not sure about Oracle, > > SDE or DB2 right now. > > 3. Does udig support spatial queries based on irregular polygons that > the user > > draws on the map? I need to be able to do this, pulling the spatial > records > > out and linking them to a MySQL database. > > > Not as of yet. It would be trivial to add this support. > > 4. Does udig support shapefiles? > > > > Yes. > > Jesse > _______________________________________________ > User-friendly Desktop Internet GIS (uDig) > http://udig.refractions.net > http://lists.refractions.net/mailman/listinfo/udig-devel > Stephen H. Savage, Affiliate Professor and Director Geo-Archaeological Information Applications (GAIA) Lab School of Human Evolution and Social Change Box 872402 Arizona State University Tempe, AZ 85287-2402 [EMAIL PROTECTED] http://gaialab.asu.edu/home - The GAIA Lab's home page http://archaeology.asu.edu/Jordan - Personal home page _______________________________________________ User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net http://lists.refractions.net/mailman/listinfo/udig-devel
