Malcolm Woodruff

Wow! Well done. Actually the amount of points does appear manageable. May I ask how you did this?

Thank you Pat and Larry0. I was afraid that such large arrays may choke VW. I will have to play with the data outside VW to get it down to something more manageable. Thank you Larry for the Pascal clip. It has been many years since I wrote in Pascal but always liked it as a programming language.

Larry0 I agree. It should be fairly easy to write a script that reads the file. However, I have no experience of Vectorscript so do not know where to start. Can you point me in the right direction to where I can learn it? The cell size is the distance in metres between points. The cell size normally is either 2m, 1m or 0.25m and the tile size is 1000m x 1000m so the umber of points will vary from 250,000 to 2million. Can VW cope with this number of points?

The grid data entry tool is close to what I want. It would have to be modified so you could select the bottom left corner rather than just the top left and the elevations need to be read from a file rather than entered manually. A typical file may have 250000 to 1m points! I have taken the asc file into Mathematica and created a new file of xyz points from it. However, reading this into VW seems incredibly slow. I have also started to look at Cloud Compare. Thank you Unearthed for the reference. It looks very interesting.

Ok. That was possibly a poor example. -9999 is a value where there is no data. Normally it means that it is sea or a lake. I have attached another which shows the elevation data better. The header lines gives the coordinates of the bottom left corner of the grid , the nrows and ncols indicates it is an array of points 500x500 at cell size = 2m crs. Then the elevations are at each of those points but do not have position data except by where they sit in the array. Yes, Tom I sometimes get data in the format you have shown. or at least xyz description. I am running Designer 2021 with latest service packs on 2014 5J 27 inch iMac with 4 core I7 and 32GB of RAM. sz6090_DSM_2M.txt

I have attached a file showing the data in the normal format I receive it. I have, however, had to change the filetype ending from .asc to.txt so that I can upload it. Once in, I will generate contours or use to generate a site model to calculate volumes etc. Tom. What file type do you bring your polygons in on? sz6094_DSM_2M.txt

HI. I often use Lidar data for site design. This comes as a set of elevation data arranged in a grid eg. a grid 500m x 500m with elevation points at 2m centres. In order to take these into VW I have to assign an x and y coordinate to each point. It would be preferable to read the array in directly. Can this be done? I am new to VW so have not experience of writing scripts for it. Any suggestions wold be most welcome.