Dale writes:
My application requires that I measure the areas of various land use types within a given project area. I had problems when I tried to append a particular shape of one land use to another shape of a different land use. I had to leave a gap to keep things from getting messy. I think I have that issue resolved by assigning each land use type to a different layer. I also had problems when I placed a node off location. I could not find a way to 'grab' the node and move it to the correct location (feature request). Deleting the shape and re-drawing it is a pain.

There are a couple techniques you can use if you are drawing filled objects that need to mesh right up against each other. If they have straight sides (not curved like a river centerline), it might be easiest to draw them using the route tool, and then convert the routes to shapes after. This is because the route tool automatically snaps to waypoints as you draw. So if you are drawing agricultural fields, and put waypoints at all of the field boundaries, as you use the route tool to "connect the dots" you'll get routes that align perfectly with the adjacent fields.

As you begin to draw a new route, ExpertGPS might show a + cursor, meaning that is going to extend an existing route. If this isn't what you want, hold SHIFT to override this.

You can move nodes to a new position by selecting the waypoint at that node and using the Move Selected tool to move it to a new position.

Once you've got everything in place, select the routes and click Convert to Shape on the Tools menu. You can then delete the routes and waypoints.

If you need to make changes to shapes, it's possible to do so. Click once with the select tool to select the shape, and then drag a selection rectangle over the node you want to move. It should be highlighted in magenta. Now switch to the Move Selected tool and drag to the new location.

I've been exchanging emails with Dennis G., an ExpertGPS user who is using the software to prepare "timber cruises" on tracts of forest land. Rather than count every tree in a parcel, foresters typically create a grid of regularly-spaced points, a "fishnet grid", that covers the tract, and then walk a line that visits a percentage of these points (say 10%). They can then extrapolate the counts they collect on their survey walk to estimate the total board-feet of timber in the parcel.

What Dennis needs is a way to create a grid of waypoints at regular intervals. He can then connect some of those points into routes for his GPS to guide him through the forest and ensure that he stays on track when he's on his timber cruise.

Since this feature sounded a lot like the Project Waypoint command in ExpertGPS, I used that dialog as the starting point for designing the Grid Builder dialog. The Grid Builder dialog is invoked from a starting waypoint - select a waypoint on the map, right-click, and click Grid Builder. From this initial point, you can then specify the height and width of each "cell" in the grid, and choose how many rows and columns will make up the grid. As you enter information, ExpertGPS draws a preview grid on the map. You can switch back and forth between the dialog and the map, which is helpful if you need to zoom in or out, or pan the map around.

Dennis originally asked for a tool to create a grid of waypoints that he could connect together into a "timber cruise" route. I added a few more options to the dialog that I hope will make it useful to a wider audience of professional users. In addition to creating a waypoint grid, the Grid Builder command can also outline the grid boundaries by creating Grid Squares or Grid Lines. If you select Grid Squares, ExpertGPS will create a checkerboard pattern of squares that outline each cell. Each cell is a single track, and the Track Type attribute for each track alternates between "Grid Square 1" and "Grid Square 2". By giving each grid square type a different fill color, I was able to make the map shown below. Each square covers exactly one acre. (a one-acre square has sides 208.71 feet long)

The other option, Grid Lines, creates a single track for each horizontal and vertical line in the grid. They alternate direction (north, south, north, south...) so that if you select them all and use the Join Tracks command, you'll end up with a single tracklog that should fit in the track memory of most modern GPS receivers. This should come in very useful the next time you want to set up a grid on the map and also refer to it when out in the field.