|
POST
|
It is set up in the coordinate definition of the data. Once described properly, yes, you can leave your data "as is", and ArcMap can project it (or any other data) to whatever you want. What are the offsets? Start off with ArcCatalog, navigate to your mine data cad file, if there is no current spatial reference applied, go and select your NAD27 state plane, right click on it, 3rd option is to copy and modify. Give it a new name like "NAD27 State Plane NM - mine local grid" or something. Edit the X & Y shifts to the correct numbers. Viola. Put it in your favourites. If you use the normal file explorer, you will see that there is now a new prj file next to the CAD file (with the same base name).
... View more
04-09-2015
01:03 AM
|
1
|
3
|
5178
|
|
POST
|
By "shift" do you mean an offset or truncation of X or Y axes or both? If you know what the offset is you can set up a "local" version of NAD27 stateplane NM west, with the X/YShift entered into the False_Easting / Northing values.
... View more
04-08-2015
08:24 AM
|
0
|
5
|
5178
|
|
POST
|
I would look at the data first! Does it make sense? Does it (the WGS84 based data) overlay nicely with other RGF defined data? And, I thought the WKID / SRID was 1671.
... View more
04-07-2015
08:55 AM
|
0
|
0
|
4058
|
|
POST
|
Can find no reference to that in the ArcGIS documentation. Just something called RD New and RD Old. So, is the DEM in metres (X, Y and Z). What is the EPSG code for "Amersfoort_Double_Stereographic projection"
... View more
04-07-2015
08:03 AM
|
0
|
1
|
1380
|
|
POST
|
And, if they are "functionally equivalent", ie they overlay. Just redefine the WGS84 based data to be RGF. No transform is necessary anyway.
... View more
04-07-2015
07:55 AM
|
0
|
3
|
4058
|
|
POST
|
Florian, that's the name of it. Arc ( and I would hope SDE) knows how to use them backwards and forwards.
... View more
04-07-2015
07:53 AM
|
0
|
4
|
4058
|
|
POST
|
This "52.1 N Latitude" is not a coordinate system. Is the data in a projected coordinate system? This is recommended for this tool (and for most other analytical tools. If it is projected, then you don't have to specify a mid latitude for the data, because the system will already know that.
... View more
04-07-2015
07:41 AM
|
0
|
3
|
1380
|
|
POST
|
That's a so called "composite" transform, a sort of 2 stage process. And this will work using the project tool. But sometimes, Arc makes some strange guesses as to correct composites. But as you want this to happen in Postgres... A quick check of the book (geographic_tansformations.pdf, in the documentation folder of the install), says there is a direct way to go from WGS84 to RGF_1993, it has WKID (I presume this is the same as a SRID) of 1671. But looking at the parameters for this, they are all 0 (zero). So RGF is already "functionally" equivalent. They are the same. So you may not have to do anything to your data, to get them to overlay properly.
... View more
04-07-2015
07:23 AM
|
0
|
6
|
4058
|
|
POST
|
What is the coordinate system for your data? Is it in Holland....
... View more
04-07-2015
04:32 AM
|
0
|
5
|
1380
|
|
POST
|
Sorry Brandon, but if you have saved it... If you are working in a SDE db, with versioning, you should be okay, the original data will still be there. If not, start looking for a backup copy.
... View more
03-31-2015
09:05 AM
|
0
|
1
|
3621
|
|
POST
|
Darren is absolutely spot on. A field named Now (as a date) has the same result. Automatically populated... The only question is... Is this an undocumented feature or an undocumented bug.
... View more
03-30-2015
11:50 PM
|
0
|
1
|
2015
|
|
POST
|
Darren, thanks for confirming this and for providing a possible explanation. Will try a "Now" attribute as well.
... View more
03-30-2015
10:59 PM
|
0
|
2
|
2015
|
|
POST
|
This whole thing started when I wanted to make a random number column and populate it in an attribute table. I added a column to the table called "Rnd" (type double). Then I opened the field calculator to populate this with a random number. But then I noticed that it was already populated with a number, all the same. Even when I calculated the field to any number (in this case 2), a different random float would appear. Even opening the table would generate another. Strangely, after the calc above, I closed ArcMap, and opened the table in Access (this is in a personal geodb), the contents = 2. Is this behavior, for a field called "Rnd" documented anywhere? And, just in case I am totally loosing it, can someone confirm that this happens on another system. My version 10.2.2. Thanks.
... View more
03-30-2015
03:13 AM
|
0
|
7
|
5536
|
|
POST
|
Copy and paster the original. Rename it. Open up the properties page in Catalog. Go to the Coord sys tab. Right click on the coordinate system. 3 option is to copy and modify. Give the your new coord sys a new name. Change the GCS at the bottom. Easy.
... View more
03-26-2015
05:15 AM
|
0
|
1
|
817
|
|
POST
|
This could, of course, be done using python / arcpy. It is a bit difficult to provide a ready made script without some more clues about the actual data. But the general flow might be : read the ID and NewXY into a python structure like a dictionary. Open up an Update cursor on the target, read each geometry, look up the new XY and update the existing. But another, non programmatic approach might be to use a topology between the 2 features. You existing stuff could be snapped automatically to the new points. Be aware that this changes the existing in place, so also make a copy beforehand before doing anything, just in case : Topology help : http://resources.arcgis.com/en/help/main/10.2/index.html#//006200000003000000
... View more
03-25-2015
03:34 AM
|
1
|
9
|
2972
|
| Title | Kudos | Posted |
|---|---|---|
| 1 | 09-08-2015 11:28 PM | |
| 1 | 12-20-2013 08:59 PM | |
| 1 | 05-14-2014 10:38 PM | |
| 1 | 12-16-2013 09:05 PM | |
| 1 | 05-31-2019 02:50 AM |
| Online Status |
Offline
|
| Date Last Visited |
11-11-2020
02:23 AM
|