A few weeks ago I responded to you and told you that we have software available that does what you are looking for, although it is not free or even very cheap. I think you are now discovering why our software which will take multiple SDTS files and put them together into 1 mid/mif file while taking care to edge match and fix the USGS georefrenceing problems is not free. Any software which does this will most likely cost you. My offer still stands that if you only have 4 or so quads that you are looking at, I will be happy to process them for you and send you the mid/mif.
Or, if you still want to go the brut force method, you can run a query to select all the records from both tables where the elevation is not some really big number. This will join the tables and sleect all the records all at once. You can then save this table and then create your grid on it. Be sure that you have saved teh DEM's as MI base tables first, otherwise the query will take a very long time to execute. Depending on where you are and how badly the USGS screwed up the quad you are in, you might stll get some bogus values between the two quads, but if you can live with the error, this will be a cheap and slow solution. Regards, Cameron ---- "Bagwell, Ross" <[EMAIL PROTECTED]> wrote: > I posted a message about this topic about two weeks ago, and I tried a > couple of approaches, but I still need any suggestions that could further > assist me: > > I have a project where I am using DEMs... specifically, the ones downloaded > from GIS Data Depot. I convert the SDTS format to DEM using a tool from the > Depot, and I change the DEM to a MapInfo Grid using another tool. The data > comes out looking great, except when you line up other DEMs, sometimes there > is a gap between them. > > I tried to do it myself by pulling in the raw data and building a grid... > first, I wanted to select two DEMs (side by side) and try to save them as > one file... and build the grid on the one file. Unfortunately, MapInfo > (running ver 6 here) only allows me to select all the points in ONE > coverage... > > so how do you select all the points in more than one coverage? > > Thank you, > > Ross E. Bagwell > Data Quality Manager > Universal Access Inc > > > This communication contains information from Universal Access, Inc. (or its > affiliates) which is confidential and may also be privileged. It is for the > exclusive use of the intended recipient(s). If you are not the intended > recipient(s), please note that any distribution, copying or use of this > communication or the information in it is strictly prohibited. If you have > received this communication in error, please notify the sender immediately > and then destroy any copies of it. > > > > --------------------------------------------------------------------- > List hosting provided by Directions Magazine | www.directionsmag.com | > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > Message number: 3200 > > > --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 3202
