On 13.2.2008, at 3:43, Jonathan Prouty wrote:

I have no "fake" data like the instructions suggest.

Just create several "surveying" points in the drawing and add them coordinates according to scale of drawing. Theoretically two such points for each scrap are enough. Martin

As MartinS wrote, you will definitely need some reference points, but they do not need to be stations. In the case, if there are no survey data - all you need to do is just to scale each scrap properly. I would do following steps: 1. Put some grid on the scanned images according to scale. Ideal is some real coordinate grid like UTM, but also some local coordinate system is OK. 2. Then set X Y coordinates of two real points and two points on the JPG image for each scrap in the section - you have to set them in "Scraps" tab in map editor - under "picture scale points" and "real scale points". In fact you have to calibrate the scraps same way, as you do it for cross-sections (with exception, that projection is plan). See Wiki for details: http://therion.speleo.sk/wiki/doku.php?id=tbe:wiki3#cross_sections After calibration - each scrap should be displayed on the correct place and in the correct scale. If you will enter real coordinates in some, UTM grid - you have to add "-cs UTM32" option to the scrap, that it will know where to put the scrap. HTH, S. Quoting Jonathan Prouty <dormat@gmail.com>:

I decided to digitize an old map of one of my favorite caves. The JPG of the entire original map was too big for therion to load, so I cut it up into smaller images that will load.Tracing the map and compiling it worked perfectly for the first section that I digitized (section_1.th2). I moved onto the second one, traced the old map same as before (section_2.th2). All that is pretty straightforward.

The problem arises when I try to join scraps from section 2 with scraps from section 1. The join fails miserably. I tried to follow the instructions from the wiki (http://therion.speleo.sk/wiki/doku.php?id=tbe:wiki4#importing_maps), but it seems the instructions are geared towards joining unsurveyed data with surveyed data. I don't see how to join unsurveyed scraps with other unsurveyed scraps. I have no "fake" data like the instructions suggest.

I've included links to an image of a portion of the old map I'm digitizing and to a PDF that therion spit out. Comparing the two will make the problem very apparent. I'm sure there is a pretty straightforward solution, I simply don't know it. Thanks in advance in for the help!

http://www.talkingnerdy.com/jonny/images/slices.png http://www.talkingnerdy.com/jonny/images/byers.pdf

-Jonny

P.S. Just in case it wasn't clear, I don't have access to any of the original survey data. The cave was surveyed in the 60s. I'd be surprised if the original data still exists.

-- ^v^ ^v^ ^v^ Take nothing but pictures, ^v^ Leave nothing but footprints, ^v^ Kill nothing but time. (**)