Latest Contributions by LincolnHood

Hi everyone, I am trying to create a relative density map of recreational boats using: the number of boats at a boat ramp the boat length classes the average distance travelled offshore for each boat length class. For example, I have 100 boats at boat ramp A and 20 boats are in the 5-10m length class. The average distance travelled by the 5-10m length class is 30 kilometers. Since I don’t know where exactly the boats go, I assume that each ocean grid cell is equally likely. However, the boat can’t travel on the mainland or through islands so those cells must be excluded. I’ve read a report that says they used a simple propagation model to propagate from the boat ramp into the ocean grid cells but I’m unclear how to do that in ArcGIS Pro. Any ideas or assistance would be greatly appreciated. Thanks! ... View more

Hi, I'm trying to use the attached jpg map of cumulative sound exposure levels (SELs) to estimate the SELs in specific locations. So I added the image to ArcMap Desktop 10.5.1 and georeferenced it to Australia. But I'm not sure what tool would be best to estimate the SELs. In a previous project, I used zonal statistics to get the mean of the specific variable in the sampling region but that doesn't work with the jpg image. I've tried to do some reading about this task but I don't think I'm wording it correctly.  I tried converting the image from a 3 band raster to a single band raster using the Make Raster Layer tool but I lose a lot of the data. Does anyone have any advice or recommendations on the best way to use this image and the associated legend with the layers in ArcMap that have the sampling regions? Thanks in advance. ... View more

Hi,   I recently began my PhD in Australia (and am very new to ArcGIS) looking at vessel traffic density near previous sample sites along the west coast.  I currently have our laboratory’s sample sites as a layer in ArcMap using the latitude and longitude but would like to create a layer with the vessel data. I’m trying to use AIS vessel data from the Australian Maritime Safety Authority which contains numerous files when downloaded from their site including .cpg, .dbf, .prj, .shp and .shx. I’ve been downloading by month so there is a lot of data included however I want to be able to cut the data down to specific dates to look at vessel traffic on a specific day. So I opened the .dbf file in excel and included in it is the Craft_Id, Lat, Long, Course, Speed, Vessel Type, Vessel Subtype, Length, Beam, Draught and Timestamp so I cut the data down to the day(s) that I needed and was adding the data to ArcMap as XY coordinates using the Lat and Long. But I want to be able to connect the coordinates based on craft_id and day so that each vessel has a track per day and then look at the density. But I can’t seem to find out how to do that. If anyone has any experience doing this I would be very grateful for the assistance.   Thank you in advance. ... View more