Latest Contributions by SepheFox

ESRI training is always a good bet, and they have many free online classes. Check out the classes listed here: Esri Training. I would start with Getting Started w/ ArcMAP, Basics of Coordinate Systems, Using ArcMap. ... View more

Hey, good for you! Many people don't understand how important that stuff is right off the bat. ... View more

Just to add to your learning Allison: data management is a very important part of ArcGIS. This includes knowing and planning where you store your files and analyses outputs, and starting with all your data in the same projection, and a projection that will work for the kind of analyses you are performing. Just keep that stuff in mind when reading and learning about ArcGIS. It is not enough to just use the tools. Good luck! I think you'll pick it up quickly considering how far you got in one day. ... View more

Yes, because as people have repeatedly mentioned, a shapefile has a 2GB size limit. ... View more

Allison, please do not use the Define Projection tool to change a projection, as it says in the document that Chris linked. This is for defining the original projection, not changing it, and will get you in a world of hurt if you use it that way. ... View more

Have a look at this and see if it helps: Fixing ArcGIS 10.1 Numpy Import Error From Python Console | mattmakesmaps ... View more

If your data is projected in a geographic coordinate system (lat/long), and not a projected coordinate system (UTM, for example), it could throw length measurements off. Also, if you made the buffers in one projection, and then changed it, or changed you data frame coordinate system so your data was being reprojected on the fly, it could also change the measurements. Unfortunately, you can't re-do a buffer, you just have to use the buffer tool again, but it's really not that much work. First step though, right click in the Table of contents where it says layers, select properties, and the coordinate system tab. Then right click your buffer dataset, and select properties, source tab, and scroll down so the coordinate system is visible. Report back what you find. ... View more

It certainly should be, but if you are using geographic coordinate system, and not projected, this could cause some problems. You can try using the Project tool to reproject your data to something else, and then recalculating your buffers. ... View more

Hi Karla, so the word test doesn't show up in your Table of Contents, just the legend? Is the text in the legend the layer name, or a label? ... View more

Well, unfortunately I got the error message that the zip file is empty. If you open the properties of the shapefile (load in ArcMap, and right click in the Table of contents), select the source tab, and post a screenshot of the result, I might be able to help you from that. ... View more

Hi Joao, I'll have a look at it, but the basic idea would be to look at the extent of the shapefile, and guess the projection from what is listed there. What part of the world are you working in? ... View more

Hi Joyce, is this question regarding the same files you were working with on your previous question? First, if the files are in a geodatabase, then they are not shapefiles, they are feature classes, and you wouldn't be able to view the separate file types as you are now. The resulting spatial join should also be written to the same geodatabase, and then you won't have a problem with the shapefile size limit. The sbn/sbx files are spatial index files. Your result will automatically create one if it is written to a geodatabase. ... View more

Don't feel bad! It takes a long time to get to know the intricacies of ArcGIS. It's not as simple as say, being a doctor. ... View more

Russel, I found an article that might help you immensely: A Framework for GIS Modeling ... View more