Latest Contributions by MelitaKennedy

I'm sorry, Joe. I moved this thread here before I realized that you'd already reposted the question here. Melita ... View more

Hi Olivia, When you use the Add XY Data tool in ArcMap, it defaults the data's coordinate system to the same as the data frame's. In this case, as you noticed, the Excel data is in decimal degrees. Import it again, but change the coordinate system in the tool to NAD 1983 (geographic coordinate system) instead. Melita ... View more

Hi Jim, We removed it in 10.1 SP1. It was causing other issues, and we wanted to 'level the playing field'. Canadians, Alaskans, and Hawaiians don't want to use the CONUS version of NADCON, and other countries don't want to see it. It's possible to write an add-in that would load it automatically (I have a VBA script that would add a different default transformation for NAD27/NAD83). Or add it in an mxd and save that as a template or use that as the base for new mxds. Once a transformation is made active in a map document, it will remain active even if there's no data that uses it. Melita ... View more

Maybe! If the last image you posted is using Albers equal area. If the original data was a raster in GRID format, you should be able to browse to its folder using Windows. In the grid file's folder, there should be a prj.adf file. It's a text file, so you can open it with Notepad. I expect that it looks something like: PROJECTION LAMBERT_AZIMUTH UNITS METERS SPHEROID SPHERE PARAMETERS 6370997.0 20 0 0.0 5 0 0.0 0.0 0.0 If it doesn't, then maybe that's the problem. What happens if you add the original raster to a new ArcMap session, and set the data frame to be WGS 1984 and change the display units to degrees. As you move the cursor around the data, do the reported latitude and longitude values make sense? Melita ... View more

We used to automatically apply the NAD_1927_To_NAD_1983_NADCON transformation in ArcMap. We no longer do it, so you'll have to apply it. Open data frame properties. On the coordinate systems tab, click the Transformations button. Depending on what the data frame's coordinate system is, highlight the other one in the top box. In the pull-down (that says None), click it and select the above transformation. Melita ... View more

You should take a look at the Cartographer's Guild. One thing you can do is georeference the map--possibly to a known place as that would be an easy to get reasonable sizing. Or georeference the map, but use made-up 'links' (target coordinates) in meters or feet, so you can set the area that your map covers. ... View more

Hi, That implies that there's something wrong with the original coordinate system definition. What happens if you display the original data with some other, known good data like country boundaries? I think it won't overlay correctly which would confirm that the original's coordinate system isn't correct. Can you post the prj.adf contents? Melita ... View more

Hello, I think the Central Meridian 200000 Latitude of origin 50000 are really: Central Meridian 20 00 00 Latitude of origin 5 00 00 in degrees minutes seconds. The values make sense for Africa, anyway. The standard parallel values are missing if the projection is Lambert conformal conic. Can you find the prj.adf file for this grid file and post its contents? It will be in the grid's folder. You won't be able to access it through ArcCatalog. It might really be Lambert Azimuthal equal area which won't have standard parallel values. Beyond that, there are no defined transformations between a sphere-based geographic coordinate system and a geodetic datum (geodetically-defined geographic coordinate reference system). The project raster tool may be having a problem because there is no available transformation. Instead, I would add the raster to ArcMap with some reference data you can overlay. Set the data frame to your target coordinate reference system. Does this layer line up? If so, right-click the layer and export it, using the data frame's coordinate system. If there's a consistent north-south offset instead, try defining a custom transformation first. Open the data frame's properties and select the coordinate system tab. Click the Transformations button. On that dialog, click the New button. Select geocentric translation for the method and leave the parameter values set to zeroes. OK all dialogs and see if the data aligns better. If so, now export it using the data frame's coordinate system. Melita ... View more

I moved this thread here, to ArcObjects SDK, because it appeared to be the most appropriate location. If you feel that's incorrect, please let me know. I believe you'll have to call IPolycurve's Densify or one of the similar methods that convert the circular arc into a densified line. Melita ... View more

?? The macro is esriSRGeoTransformation_NAD1983_To_WGS1984_1 but you can always use the well-known ID instead, 1188. You would use it to create a geotransformation that would then be used with the ProjectEx or ProjectEx5 methods. Melita ... View more

Hi Sara, What happens if you redefine it as RT90 (Define Projection Tool), then Project it to SWEREF? Melita ... View more

Also check out this thread from Cartotalk on creating drop shadows. Also search for figure-ground effects. Melita ... View more

I have no idea what could be the problem but it's not the choice of geographic coordinate system. The difference between the various NAD 1983 re-adjustments in Texas is sub-foot, so there's some other issue occurring. I wish I could be of more help, Melita ... View more

Hi Dennis, It's actually still supported, but marked as deprecated. Because it's marked as deprecated, it doesn't show up as part of the coordinate systems / prj "files". And, I see that although we support using the well-known ID in ArcMap now, it's actually comparing against the active list and won't work. Hmmmm. We'll (the team) discuss it--please send me an email too about it, mkennedy at esri dot com. Melita ... View more