Latest Contributions by SarahMcCabe

‎02-11-2020

I really like the colorway and Legend on this NOAA ESRL chart. How can I get something like that to use in ArcMAP? I am working with a catalog of 29 images by year, grid values are Julian dates range 72 to 189 or so. (the topic is when the snow leaves the landscape.)

‎11-05-2019

Yes, the points on the lake boundary were densified to about 2 meters. I looked at the instructions for Spatial Analyst>Interpolation> Natural Neighbor. It recommends two steps I don't have in my data: 1) use a projected coordinate system 2) "First, create a TIN from your source data. Then, convert the resulting TIN to a raster with the TIN To Raster tool, using the Natural Neighbors option. This is particularly useful if you have breaklines or an irregularly shaped data area." When was the last time you met a TIN?

‎11-05-2019

I am working on organizing and cleaning some lake bathymetry measurements. In my data sets, the lake boundaries were digitized, and the vertices of the boundaries were used as points where the depth value was zero. Those points were combined with the actual depth measurements, and a bathymetry surface was generated using Spatial Analyst>Interpolation>Natural neighbor. In general this worked well, however, in some areas where the slope of the lake bottom was steep, or the lake boundary was complex, the generated surface spills over the lake boundary, and the contour lines generated from the bathymetry surface go over the lake boundary, or obliterate an island. I am looking for a better method.

‎05-09-2019

What I did: Showing the exact date of the year is less important for my viewer than orienting them to the approximate time of year. I made a shapefile of points called "Months_Time" with the dates of my data, with fields for Month and Year. I made the label to be a string concatenation of those two fields. I turned on “Time” in the properties of the shapefile. When I ran the time slide, the appropriate Date and Year showed as labels in “Comic Sans” type. The end result is as the visualized data in my avi. file moves around, the month and year changes.

‎05-08-2019

ArcMap.

‎05-07-2019

I am using a time slider to make a short film showing weather data over several months. The time slider shows "Time" on the map display, not "Date." Is there a way to change this?

‎05-07-2019

Thanks - there is a lot of information there. The ones for which we are still missing bathymetry are Kukaklek and Nonvianuk, which I did not find there.

‎04-11-2019

I will try that - you mean, group them in a Layer, in sequence? Never heard of the animation toolbar. Missed that somehow.

‎04-10-2019

I have 12 years of 89 daily .tifs. (Snow/Climate derived from MODIS) I think I want to animate them, but there is no time field in these 1band Zero/One .tifs. The only time stamp is in the file name. How would I animate them?

‎04-09-2019

#3d mapping bathymetry‌ #limnology Alaska GIS Users‌ I want to calculate (or find data on) the volume facts of the larger lakes in Alaska (specifically in the National Parks.) Is this data at the State of Alaska? or at other agencies? Would our fancy new IfSAR collection be helpful/useless? Coastal Mapping project? I would appreciate a pointer to this information.

‎04-04-2019

I have a set of about 150 daily rasters derived from MODIS images (to start with, really 16 years worth). I want to make a model that will take seven at a time and sum them, so there is a weekly summary. I am working with model builder, and I think I have several sub-tasks: Select seven rasters Run them (with Feedback) through the Sum tool Name the sum (based on the last day of my selection). Select the next seven rasters ... Until my file of rasters is empty. I was wondering about making sure my iterator did not start at the top again.I have been messing with the raster iterator, the For tool, and have had minimal success. Any advice? I have been considering trying to do this with python, which is a minimal skill for me, or doing it with brute force.

‎03-28-2019

What I ended up doing: I made a model that calculates the point insolation value sequentially. It also controls the latitude for each point, and the size of the Digital Elevation Model so that it works more efficiently than calculating the value with the entire state of Alaska. This tool: 1) Builds a buffer from each value in the point file (Field Name: Buffer_m) 2) Clips a DEM to by the buffer size, setting Latitude and Extent values 3) Calculates the Insolation value for each point using the parameters in the Tool 4) Collects the values and merges them in a point file. The Model has two layers. The Inner model Iterates through the point feature class, creating a buffer around each point, then clips the DEM to that buffer, and feeds the small DEM and the point to the Point Insolation Tool. The results of the tool are collected, and fed to the outer layer of the tool, which merges the points into a feature class. The input parameters (light blue) for the Point Insolation Tool have to be exposed at both levels, so that they can show up as input fields when the user “opens” the tool as opposed to “edits” it. Outer Model Layer "Insolation Collector": Inner Model Layer "MultiPoint Insolation": Performance: Calculating the values for a set of 61 points takes about 10 minutes, with the Environment setting of using 88% for the “Parallel Processing Factor” setting. The grid size of the DEM was 60 meters – this makes a large difference how long it takes to finish. There were some sticking points: Input Points must be in the same projection as the Digital Elevation Model, in meter units. Set Geoprocessing options so that “Overwrite the outputs” is set to YES, and “Add results of Geoprocessing Operations to the display” is set to NO Elements within the model also should not be set to “Add to the display.” Features that were not located on the DEM will not process, and the Output will have fewer features than the Input Feature Class. At the end of processing the points, I joined the resulting table to the original feature class.

‎03-25-2019

Those two errors happen when the points and the elevation model are not in the same projection.

‎03-14-2019

I will paste back the two illustrations of where to turn off "Add to Display" - the first in Geoprocessing options, the second accessed in the Model Builder Edit mode, by right-clicking the product of the function that should be over-written. The point is that when they are automatically added to the Display, they can have a lock that prevents them from overwriting.

‎03-12-2019

Now I find that my model goes past the buffer problem when it is in "Edit" Mode, but not when it just "Open" to put in different parameters. A mystery!

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Date Last Visited	‎05-12-2022 07:33 PM

My Ideas

Latest Contributions by SarahMcCabe

NOAA weather Chart Legend - raster catalog

Re: Lake bathymetry from points - how to contain the surface

Lake bathymetry from points - how to contain the surface

Re: Time Slider - Replace "Time" with "Date"

Re: Time Slider - Replace "Time" with "Date"

Time Slider - Replace "Time" with "Date"

Re: Alaska Lake Volume/Bathymetry I am looking for data.

Re: Animating a .tif sequence

Animating a .tif sequence

Alaska Lake Volume/Bathymetry I am looking for data.

Model Builder - Summing daily rasters by week

Re: Solar Radiation Tools -

Re: Error in calculating Area Solar Radiation

Re: In Model Builder, does "Overwrite Geoprocessing operation products" apply?

Re: In Model Builder, does "Overwrite Geoprocessing operation products" apply?

Solar Radiation Tools -

Re: Solar Radiation Tools -

Re: In Model Builder, does "Overwrite Geoprocessin...

Re: Time Slider - Replace "Time" with "Date"

In Model Builder, does "Overwrite Geoprocessing op...