[Qgis-user] advice on which CRS to use

[Neil B]

Steve: Make sure the CSV with the Lat/Longs are set to use CRS WGS84
(EPSG:4326) or NAD83 (EPSG:4269) within your project. Your Lat/Longs are
showing up in Pennsylvania because they are using EPSG 2263 as the CRS and
the Long/Lats are being interpreted as XY's in feet. For older versions of
QGIS, to use mixed CRS's within a project, OTF (On The Fly)
Transformation has to be turned on and may not be applicable in your case
if you're using a newer version of the software. If whatever means of
loading the CSV file does not provide the ability to set the CRS on load,
it can be set after the file is loaded.

Right-click on the layer and go to Properties... (at the bottom of the
list). Click on the Source tab and set the correct CRS. If EPSG:4326 or
EPSG:4269 are not in the dropdown click on the icon just to the right and a
dialog box will open. Type either 4326 or 4269 in the filter at the top and
make your selection in the middle window. Once selected, press OK to close
the Coordinate Reference System Selector dialog box. Then click OK again to
apply and close the Layer Properties dialog box. Your points should now
show up in the correct location.

Just an FYI that 3 decimal places in Lat/Long have a precision of
approximately 350ft for your location.

On Sat, May 9, 2020 at 7:28 PM Stephen Sacks <sacks44 at earthlink.net> wrote:

> I'm mapping the location of trees and plants along the famous Promenade in Brooklyn,
> NY.   Above a bottom layer of GoogleSatelliteHybrid, I've drawn polygons
> representing 35 gardens, and then there are layers for trees in each
> garden, plants, etc.  The project CRS is EPSG:2263 since having coordinates
> measured in feet is very convenient because volunteers are giving me pieces
> of graph paper with trees, etc. marked in pencil;  each square on the graph
> paper represents one foot.  I want to plot all that relative to the
> northwest corner of each garden.
>
>    Now here's my problem.  Using my cell phone and an Android app called
> Lat Long, I captured latitude and longitude at each corner.  When I
> create a layer of garden corners they all appear to be in Pennsylvania.  I
> know that this forum (and many web sites) are full of hundreds of
> explanations of how to reconcile different CRS's.  I've read many lengthy
> explanations and advice.  I'm sorry to be dumb, but I just can't bring
> those corner points back to Brooklyn.  I know that along my gardens the
> longitude is something like -73.993 degrees (or 985217 feet) and latitude
> approximately 40.695 degrees (or 193982 feet).   And the long and lat
> reported by my phone is close to that.  But when I put long and lat into
> QGIS (by reading delimited data from a .csv file) the long becomes -77.519
> and the lat  40.112 (about 200 miles west and slightly south of where they
> should be).  The .csv file has columns labelled "Longitude" and "Latitude"
> ;  the Data Source Manager >  Delimited Text  window shows that QGIS got
> that right.   The attribute table of that layer seems to confirm that.
>
>     I've tried loading the corner points file and then saving it as a
> shape file with crs 2263,  but it still puts those points in Pennsylvania.
>
>      Any advice would be very welcome.  Thanks in advance for your
> thoughts.
>
> Steve
>
>
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