4,446 reputation
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location Hamilton, Canada
age 36
visits member for 2 years, 7 months
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Nov
15
comment River flow downhill
Does this have to be completed in ArcGIS? If you are willing to use alternative GIS applications, you can look at free and open source solutions, such as QGIS and Grass. There are lots of examples of how to do this online, and in this forum.
Oct
29
comment Web Maps for Collecting Information in a Questionnaire
Thank you Mark, but one of the restrictions is development, regardless of how simple you may think it is.
Oct
24
comment Are there any convenient sources of color palettes to use in ArcGIS software while producing maps?
Doesn't seem to on my end.
Oct
17
comment Features to 3D from 2D in QGIS
Convert what? Lines, polygons, points?
Sep
30
comment Is cost of new LiDAR data reasonable for deliverables provided (in Canada)?
Glad I could help
Sep
30
comment How to style a Vector layer in QGIS using a numeral of an attribute
I totally understand. Glad it helped.
Sep
29
comment Is cost of new LiDAR data reasonable for deliverables provided (in Canada)?
I worked at a company in the US that flew orthos and LiDAR. I wouldn't say the is a bad quote or a good quote. Will the company perform any classification. I am sure they may for the production of the DEM, but it may be useful to get the classification results as well. What is the X,Y,Z accuracy?
Sep
8
comment QGIS equivalent to ArcMap Aggregate Polygons
You may want to look at the aggregate functions in PostGIS: postgis.net/docs/…
Sep
4
comment Word cloud labels in QGIS from database
@mapBaker no I do not know if a good PostgreSQL modeler
Sep
3
comment Word cloud labels in QGIS from database
@mapBaker I used a collection of software to make that. The schema/table relationship was made with Navicat Data Modeler. The map graphic was made with QGIS, and the text and "put-togetherness" was finalized in Inkscape. I would be great if there was a method, or better a tool to do all of this in QGIS.
Jul
22
comment How likely is it that Smartphone Camera GPS coordinates are wrong?
I am sure there is a way to change the data on the EXIF, but it is very unlikely.
Jul
22
comment Setting the Geometry with sql query
Without looking at the data it is a little difficult for me, but you could look at table joins or spatial joins. I am assuming you have some data with birth rates (points or polygons). If the birth rates data has any attributes related to the state, then you could do a table join with the state polygon to put that data into the state table. Otherwise, you may want to do a spatial join. Going about this will depend on how your data is put together.
Jul
22
comment Setting the Geometry with sql query
What software are you using to do this. A shapefile is not a database, and the query you are using is specific to a spatial database (ie: Spatialite, PostGIS, etc.). If you want to do those types of queries you will want to put your data into a spatial database (like the types mentioned above).
Jul
18
comment Image classification using google satellite images
You could do that, but be careful about having hard and fast rules. One of the issues with classification is that it uses real world imagery; and real world imagery has variation. Setting a RGB value may result in different classes depending on the temporal and spatial location of the image. If you will be using a repetitive location (ie: time series analysis) then you may be ok. But if you are not, or you will be looking at temporal change, then you will have to deal with a feature having different pixel values at different times of the year (ie: trees). Also don't forget about clouds, etc.
Jul
18
comment Image classification using google satellite images
That will depend on what you are using to classify. If I assume correctly, you are making your own? You will want to look at the pixel values of each band. But you may want to do a neighbour search (3x3, 5x5, 7x7, etc.). Object oriented classification looks at the direction, orientation, proximity, and other aspects of pixels.
Jul
14
comment Is it possible to embed a Qgis map with all the information I added, in my website?
Look at CartoDB. I have a free account with them. You are limited to the number of layers you can show on the free web map. cartodb.com/signup Signup and you will default to the free account
Jul
14
comment Is it possible to embed a Qgis map with all the information I added, in my website?
You will be able to use QGIS to make some of the data. I have used MapBox and CartoDB to do this very thing. I found that GeoJSON is the best data format for web maps such as MapBox and CartoDB.
Jun
24
comment Using the Rule-based style to calculate each grid cell from overlaps
No problem Joseph. What I do in cases like yours is to add a filter for each option (ie: CASE). So if you have 4 options you are looking at, then you would want to add 4 different filters. Each filter could have a multiple attribute query. I have added a graphic showing what I mean.
Jun
19
comment Is there a way to use gdal functions from OSGeo4W out of their shell?
Then I am not sure what you mean. If you can access gdal commands from OSGeo4W then what is the issue? Do you want to bundle things from your ESRI python? That may not be possible, but I will let someone else tackle it. I have python scripts that call gdal. What I have done is to evoke it from a commandline tool, but I have to type python first, then the python script file (ie: python c:\temp\cool_script.py) If you want to use an ESRI script and a gdal script for processing, you may have to batch that. Create a bat file that calls the scripts in order, or even a python script to do that
Jun
19
comment Is there a way to use gdal functions from OSGeo4W out of their shell?
So for example, in OSGeo4W if you type gdal_merge nothing comes up? You should see something like this: Usage: gdal_merge.py [-o out_filename] [-of out_format] [-co NAME=VALUE]* [-ps pixelsize_x pixelsize_y] [-tap] [-separate] [-q] [-v] [-pct] [-ul_lr ulx uly lrx lry] [-init "value [value...]"] [-n nodata_value] [-a_nodata output_nodata_value] [-ot datatype] [-createonly] input_files [--help-general]