Latest Contributions by tomcousins

‎12-19-2016

Hi Abullah This would assume that the the distances are all equally distant from each other which they are not. This is the maths behind trilateration: Trilateration - Wikipedia

‎12-17-2016

Hi I am trying to find a way to natively trilateral between three points in ArcMap, using the Distance-Distance construction feature I can do this with two measurements but is there a way to give a third input measurement? I've also tried buffering each point by the distance and then running an intersect but the issue is, especially with hand collected data, if the records are not 100% accurate you are left with a "cocked hat" where the three circles do not intersect so the point has to be placed manually. this is also quite time intensive when you have multiple fixes to plot.

‎12-14-2016

Hi, is there a way to plot tidal movement in ArcMap? I am trying to plot how far larvae spawned into the water column from shipwreck site will get in a certain time. I have two main sources of data for this the tidal atlas for the region and the tidal diamond on the admiralty chart and i am plotting them in manually by using Direction/Length in 1 hour sections. I was thinking of making a fishnet grid over the area and in the attributes adding a column for the time relative to HW Dover, with a polar bearing, and a speed column. but Im unsure of how to go past this point. any help or ideas is apprecated

‎08-16-2013

I have two shapefiles positioned with X,Y & Z data of the same object from two sides with 4 common points. The problem comes when I try a spatial adjustment on the data to fit them together it only connects the points on the X and Y planes and not the Z, Is there a way to adjust the data in 3d to combine the two surveys? Thanks for your time Tom

‎06-04-2013

Do you have your points set on the line? Do you know the distances of the points along the line from a given starting point. If so, use Linear Referencing. Use Create Routes Features on your lines. The value for the position along the line will be the measure value of the points on the line and the side offset distance will make the points parallel and tangent to the line. Just change the offset between positive or negative values to alter the side of the line the point will appear on. If the points are already created on the line use Locate Features Along Route to get their measure so that you can convert them to events and apply the side offset field to position them as offset points. I'm not 100% sure how to try the method you've mentioned above anyway you can break it down a bit? I've managed to plot the points manually using direction/length and point at the end of a line but I'm looking for a faster way to do it, Like on COGO where I put in the distance offset and what side of the line and it creates an offset-ted polyline The data I have at the moment is a table with 4 columns, ID, Distance, Offset, Description.

‎06-04-2013

I've got a series of points recorded as an offset off from a baseline that I need to plot. using the COGO feature I have plotted in the polyline features but I'm trying to plot in the points in a similar fashion but I cannot seem to find a way to do it.

‎03-11-2013

I'm trying to work out if there is a way to create custom marker made from polylines (I have the image as a SVG and SHP). Ideally i want to keep each symbol at a fixed scale and orientation depending on the attributes, IE is the object was 1m long at 90* it would stay at the right scale is this possible or would It just be easier to create individual polylines for each symbol?

‎07-07-2012

When i import certain geotiffs into arcmap 10 the images are projecting the wrong way, with half mirroring from the left extent and half mirroring from the right extent. so C is in the correct place but B is to the east rather than the west where it should be [ATTACH=CONFIG]15837[/ATTACH] can anyone help me find out the cause of this and a way to fix it Thanks

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My Ideas

Latest Contributions by tomcousins

Re: Trilateration in ArcMap

Trilateration in ArcMap

Tidal Movement Models

spatial adjustment Z data

Re: offset points from a line

offset points from a line

Custom Shapefile Markers

GeoTiffs showing as a mirror image