Re: [Qgis-user] Buffer by Attribute Issue
Chris and list It is working for me now. Sorry, when I said lat/long I had meant the points were imported as Lat/Long EPSG:4326 from a text file. But subsequently projected to 3857. Example point in the project CRS ( EPSG:3857) -11923424,5461258 So I think I found the problem. Seems one workflow works and the other doesn't. You must select the Attribute Field from the field list and then edit the expression. This works. I thought I had tried it yesterday but suspect I didn't have the expression right. What I spent time with was using the Assistant dialog. That did not work. I was able to reproduce that it does not work. So the workflow that works is select the attribute Field and then go to Edit the Expression. I was unable to get it working using the Assistant dialog. thanks for the great help! Peter On Thu, Dec 16, 2021 at 2:50 PM chris hermansen wrote: > Peter and list > > On Thu, Dec 16, 2021 at 7:08 AM Peter Devanney wrote: > >> Chris >> >> The buffer input is a point the lat and long are Doubles. The buffer >> distance variable is a Double. Using EPSG 3857 for all. >> > > I just created a point shapefile in EPSG:3857, added a field called > "bufferdist", added three points with bufferdist set to 1000, 2000 and 5000 > respectively. > > EPSG:3857 is in metres, are readily visible and as far as I can tell from > measuring the buffers were correctly created in the correct size. > > In the buffer dialogue did you click on the button next to the distance / > units pair and next to "field type >" select your field, which would > deactivate the distance / units pair? > > Your mention of "lat and long" troubles me. EPSG:3857 is a projected > coordinate system, not a lat/lon system. > >> >> Not sure what the protocol on the list is or if it will accept a small 2 >> MB .mp4 but I can show what I am doing for workflow if that might help? >> >> thanks Chris >> >> Peter >> >> On Wed, Dec 15, 2021 at 6:42 PM chris hermansen >> wrote: >> >>> Peter and list, >>> >>> On Wed, Dec 15, 2021 at 7:26 AM Peter Devanney >>> wrote: >>> >>>> Hi Folks >>>> >>>> Have a table full of points that I want to buffer by a variable >>>> distance. The distance is an attribute in the input table in km. >>>> >>>> Using Vector>Geoprocessing>Buffer It works fine if I specify a fixed >>>> buffer. >>>> >>>> When I run it with the attribute selected it runs fine but it will not >>>> paint the buffers. At first I thought I had a unit issue so added an >>>> expression to multiply the attribute by 1000 to get to km from m as I >>>> wasn't sure if the default was m. >>>> >>>> The buffered output behaves totally normally so I can label, and zoom >>>> to features... All looks fine except no actual buffers draw. Symbology >>>> panel looks normal. >>>> >>>> Just wondering if anyone has seen this or knows of a workaround or >>>> thoughts on what I am doing wrong. >>>> >>>> What is the type of your buffer item? What are the typical values? >>> >>> What is your CRS? >>> >>> >>> -- >>> Chris Hermansen · clhermansen "at" gmail "dot" com >>> >>> C'est ma façon de parler. >>> >> > > -- > Chris Hermansen · clhermansen "at" gmail "dot" com > > C'est ma façon de parler. > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Buffer by Attribute Issue
Example point in the project CRS ( EPSG:3857) -11923424,5461258 I have had the buffer problem with a GCS like but just usually convert to a UTM to do analysis. I was using a pseudo mercator here because the web maps are in that CRS and don't distort as a base map for a quick view of some data. Buffer works with a fixed distance specified in the Buffer dialog; but not when I try to use an attribute from the table as a buffer distance variable. thanks Peter On Thu, Dec 16, 2021 at 10:19 AM Richard Duivenvoorde wrote: > On 12/16/21 16:08, Peter Devanney wrote: > > Chris > > > > The buffer input is a point the lat and long are Doubles. The buffer > distance variable is a Double. Using EPSG 3857 for all. > > So your data is in lat/lon so in degrees? > Or in EPSG:3857 units (more or less meters)? > Can you show the coordinates of your point layer (also EPSG:3857 ?) > > What if you select/copy one point, does it look like (a point in NL) > > wkt_geom > Point (542953.32029126526322216 6792876.35233329329639673) > > or > > wkt_geom > Point (5.50943334180317645 52.15814766031191851) > > ? > > > > Not sure what the protocol on the list is or if it will accept a small 2 > MB .mp4 but I can show what I am doing for workflow if that might help? > > Nope, I think attachments > 75kB are removed or held back > > Regards, > > Richard > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Buffer by Attribute Issue
Chris The buffer input is a point the lat and long are Doubles. The buffer distance variable is a Double. Using EPSG 3857 for all. Not sure what the protocol on the list is or if it will accept a small 2 MB .mp4 but I can show what I am doing for workflow if that might help? thanks Chris Peter On Wed, Dec 15, 2021 at 6:42 PM chris hermansen wrote: > Peter and list, > > On Wed, Dec 15, 2021 at 7:26 AM Peter Devanney wrote: > >> Hi Folks >> >> Have a table full of points that I want to buffer by a variable distance. >> The distance is an attribute in the input table in km. >> >> Using Vector>Geoprocessing>Buffer It works fine if I specify a fixed >> buffer. >> >> When I run it with the attribute selected it runs fine but it will not >> paint the buffers. At first I thought I had a unit issue so added an >> expression to multiply the attribute by 1000 to get to km from m as I >> wasn't sure if the default was m. >> >> The buffered output behaves totally normally so I can label, and zoom to >> features... All looks fine except no actual buffers draw. Symbology panel >> looks normal. >> >> Just wondering if anyone has seen this or knows of a workaround or >> thoughts on what I am doing wrong. >> >> What is the type of your buffer item? What are the typical values? > > What is your CRS? > > > -- > Chris Hermansen · clhermansen "at" gmail "dot" com > > C'est ma façon de parler. > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Buffer by Attribute Issue
Hi Folks Have a table full of points that I want to buffer by a variable distance. The distance is an attribute in the input table in km. Using Vector>Geoprocessing>Buffer It works fine if I specify a fixed buffer. When I run it with the attribute selected it runs fine but it will not paint the buffers. At first I thought I had a unit issue so added an expression to multiply the attribute by 1000 to get to km from m as I wasn't sure if the default was m. The buffered output behaves totally normally so I can label, and zoom to features... All looks fine except no actual buffers draw. Symbology panel looks normal. Just wondering if anyone has seen this or knows of a workaround or thoughts on what I am doing wrong. I am running 3.16.8 Hannover on mac OS 11.6 thanks Peter ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] CSV Import records missing on map
Andrea, Garth Thanks for the suggestions and tips. I would have shared the file or some of the data but was unable to get in touch with the data owner for permission in a timely manner. I thought I would share the workaround and experience in case anyone else runs into this. Based on Garth's comments I updated the DMS to ensure it used the specific characters mentioned above ( "The degree symbol ° fails while º works. Under Mac OS X 10.13 the first is Option-Shift-8, the second is Option-0 (opt-zero)."). QGIS still would only successfully assign geometry attributes to a few of the imported records and none to others. In the end I used the Microsoft support site VBA code to do the conversion in Excel from DMS to D.D and then 100% records imported ok as a delimited text file into QGIS. I did have to change the degree symbol from Option-0 to Option-Shift-8 and the seconds symbol from a double single quote to proper double quotes or I could have changed it in the VBA script as well. If I had been a better Python text wrangler I probably could have dealt with modifying a N45 00 00.0 to 45° 00' 00.0 " programmatically without going through the data and adding the ° ' and " manually but at least I have a solution. There are not too many records. Thanks again for the suggestions. Peter On Mon, Sep 27, 2021 at 3:56 PM Garth Fletcher wrote: > CVS import of DMS coords is touchy in my experience. > The degree symbol ° fails while º works. > Under Mac OS X 10.13 the first is Option-Shift-8, the second is > Option-0 (opt-zero). > Also, it seems to want ' for minutes and ' ' for seconds, i.e., a single > ' and two separate '. > It rejects a normal " double quotes, and I'm sure will reject "smart" > quotes, i.e., the ones > that lean in different directions. > > Since I figured those quirks out I have not had any problems with DMS > notation. > > -- > Garth Fletcher > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] CSV Import records missing on map
Agustín Thanks for the tip. I did try placing the lat and long fields as columns 1 and 2 with no success. It is very strange. I guess I will have to get the DMS converted to D.D and go from there. Best regards Peter On Sun, Sep 26, 2021 at 10:11 PM Agustín Diez Castillo wrote: > Hi, > Are latitude and longitude among the first fields? I will try with them in > field 2 and field 3, let field 1 for ID if you wish so. In this way, you > can be sure if the problem is in another field or just in one of them. > This trick helped me in te past to see where was the problems. Nicolas’ > suggestion will be the correct way to go (if you’re in Windows), but the > other could help to see what it’s going on. > Best > Agustín > > On 26 Sep 2021, at 17:39, Nicolas Cadieux > wrote: > > Hi, > > I have never used DMS, but rather Degrees in Decimals so perhaps that is > the problem. Make sure what is currently imported is actually in the > correct place in DMS. > > Normally, problems with csv is related to empty field or extra > separators. Look at the file in notepad or notepad ++ and eliminate to > problematic characters to make sure columns are Perfectly aligned. This can > be hard to find if the separator is a space character. > > Nicolas Cadieux > https://gitlab.com/njacadieux > > Le 26 sept. 2021 à 16:48, Peter Devanney a écrit : > > > Hello > > I have an issue I have never run into before. > > I am adding a delimited text (CSV) layer and only some of the records > appear on the map. 36/118 records show. The rest do not show but are still > in the attribute table. > > When I run add geometry attributes or do an export to .shp I only see the > 36 records that showed up on the map. > > All records look identical in the source CSV. I cannot see any difference > that would explain why one record imported successfully with geometry > attributes and the others didn't. > > The CSV file has separate Lat and Long columns with coordinates in DMS > Latitude Longitude > N45 45 56.1 W075 27 51.3 > > I am running 3.16.8 on OS X Big Sur 11.5.2 > > Scratching my head as to why some records import ok and the others do not, > even though all show up in the attribute table. > > thanks > > Peter Devanney > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] CSV Import records missing on map
Nicolas Thanks for the tip. I did check in Textedit and only see commas as separator values and the DMS all look formatted the same. This is also my first time having to use DMS - I usually use D.D without any issues. Peter On Sun, Sep 26, 2021 at 8:39 PM Nicolas Cadieux wrote: > Hi, > > I have never used DMS, but rather Degrees in Decimals so perhaps that is > the problem. Make sure what is currently imported is actually in the > correct place in DMS. > > Normally, problems with csv is related to empty field or extra > separators. Look at the file in notepad or notepad ++ and eliminate to > problematic characters to make sure columns are Perfectly aligned. This can > be hard to find if the separator is a space character. > > Nicolas Cadieux > https://gitlab.com/njacadieux > > Le 26 sept. 2021 à 16:48, Peter Devanney a écrit : > > > Hello > > I have an issue I have never run into before. > > I am adding a delimited text (CSV) layer and only some of the records > appear on the map. 36/118 records show. The rest do not show but are still > in the attribute table. > > When I run add geometry attributes or do an export to .shp I only see the > 36 records that showed up on the map. > > All records look identical in the source CSV. I cannot see any difference > that would explain why one record imported successfully with geometry > attributes and the others didn't. > > The CSV file has separate Lat and Long columns with coordinates in DMS > Latitude Longitude > N45 45 56.1 W075 27 51.3 > > I am running 3.16.8 on OS X Big Sur 11.5.2 > > Scratching my head as to why some records import ok and the others do not, > even though all show up in the attribute table. > > thanks > > Peter Devanney > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] CSV Import records missing on map
Hello I have an issue I have never run into before. I am adding a delimited text (CSV) layer and only some of the records appear on the map. 36/118 records show. The rest do not show but are still in the attribute table. When I run add geometry attributes or do an export to .shp I only see the 36 records that showed up on the map. All records look identical in the source CSV. I cannot see any difference that would explain why one record imported successfully with geometry attributes and the others didn't. The CSV file has separate Lat and Long columns with coordinates in DMS Latitude Longitude N45 45 56.1 W075 27 51.3 I am running 3.16.8 on OS X Big Sur 11.5.2 Scratching my head as to why some records import ok and the others do not, even though all show up in the attribute table. thanks Peter Devanney ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
