Using st_join for a spatial join
I am using the sf_package to work around spatial data in r. At this stage, I want to make a spatial join so that the tax lots of my area of study inherit the attributes of the floodplain on which they are located. For example, taxlots may be located in a floodplain categorized as X, VE, A, A0, or V (these are codes that relate to the intensity of the flood in each area).
To do this, I tested the sf function st_join, which will by default rely on st_intersects to determine the spatial join for each entity of my tax lots.
However, I am trying to figure out the criteria used by the function when a tax lot intersects with two different floodplain areas (as in the photo below, in which several lots intersect both with an A floodplain and an AE floodplain). Does it take the value of the area that covers the largest area of the lot? or is it a matter of which area is located upper in the dataframe?
Note that I am not interested in partitioning the intersecting lots so that I divide them according to their areas intersecting one and other floodplain zones.
Photo of tax lots intesecting with more than one floodplain category
r gis intersection sf
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
add a comment |
I am using the sf_package to work around spatial data in r. At this stage, I want to make a spatial join so that the tax lots of my area of study inherit the attributes of the floodplain on which they are located. For example, taxlots may be located in a floodplain categorized as X, VE, A, A0, or V (these are codes that relate to the intensity of the flood in each area).
To do this, I tested the sf function st_join, which will by default rely on st_intersects to determine the spatial join for each entity of my tax lots.
However, I am trying to figure out the criteria used by the function when a tax lot intersects with two different floodplain areas (as in the photo below, in which several lots intersect both with an A floodplain and an AE floodplain). Does it take the value of the area that covers the largest area of the lot? or is it a matter of which area is located upper in the dataframe?
Note that I am not interested in partitioning the intersecting lots so that I divide them according to their areas intersecting one and other floodplain zones.
Photo of tax lots intesecting with more than one floodplain category
r gis intersection sf
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
add a comment |
I am using the sf_package to work around spatial data in r. At this stage, I want to make a spatial join so that the tax lots of my area of study inherit the attributes of the floodplain on which they are located. For example, taxlots may be located in a floodplain categorized as X, VE, A, A0, or V (these are codes that relate to the intensity of the flood in each area).
To do this, I tested the sf function st_join, which will by default rely on st_intersects to determine the spatial join for each entity of my tax lots.
However, I am trying to figure out the criteria used by the function when a tax lot intersects with two different floodplain areas (as in the photo below, in which several lots intersect both with an A floodplain and an AE floodplain). Does it take the value of the area that covers the largest area of the lot? or is it a matter of which area is located upper in the dataframe?
Note that I am not interested in partitioning the intersecting lots so that I divide them according to their areas intersecting one and other floodplain zones.
Photo of tax lots intesecting with more than one floodplain category
r gis intersection sf
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
I am using the sf_package to work around spatial data in r. At this stage, I want to make a spatial join so that the tax lots of my area of study inherit the attributes of the floodplain on which they are located. For example, taxlots may be located in a floodplain categorized as X, VE, A, A0, or V (these are codes that relate to the intensity of the flood in each area).
To do this, I tested the sf function st_join, which will by default rely on st_intersects to determine the spatial join for each entity of my tax lots.
However, I am trying to figure out the criteria used by the function when a tax lot intersects with two different floodplain areas (as in the photo below, in which several lots intersect both with an A floodplain and an AE floodplain). Does it take the value of the area that covers the largest area of the lot? or is it a matter of which area is located upper in the dataframe?
Note that I am not interested in partitioning the intersecting lots so that I divide them according to their areas intersecting one and other floodplain zones.
Photo of tax lots intesecting with more than one floodplain category
r gis intersection sf
r gis intersection sf
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
edited Nov 15 '18 at 19:53
Pablo Herreros Cantis
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
asked Nov 15 '18 at 19:15
Pablo Herreros CantisPablo Herreros Cantis
488
488
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
By default, st_join(x, y, join = st_intersects) duplicates all features in x,
that intersect with more than one features from y.
If you set the argument largest = TRUE, st_join() returns the x features augmented with the fields of y that have the largest overlap with each of the features of x.
See https://r-spatial.github.io/sf/reference/st_join.html and https://github.com/r-spatial/sf/issues/578 for more details.
answered Nov 16 '18 at 9:01
csteppercstepper
912
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53326481%2fusing-st-join-for-a-spatial-join%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
By default, st_join(x, y, join = st_intersects) duplicates all features in x,
that intersect with more than one features from y.
If you set the argument largest = TRUE, st_join() returns the x features augmented with the fields of y that have the largest overlap with each of the features of x.
See https://r-spatial.github.io/sf/reference/st_join.html and https://github.com/r-spatial/sf/issues/578 for more details.
answered Nov 16 '18 at 9:01
csteppercstepper
912
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
add a comment |
By default, st_join(x, y, join = st_intersects) duplicates all features in x,
that intersect with more than one features from y.
If you set the argument largest = TRUE, st_join() returns the x features augmented with the fields of y that have the largest overlap with each of the features of x.
See https://r-spatial.github.io/sf/reference/st_join.html and https://github.com/r-spatial/sf/issues/578 for more details.
answered Nov 16 '18 at 9:01
csteppercstepper
912
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
add a comment |
By default, st_join(x, y, join = st_intersects) duplicates all features in x,
that intersect with more than one features from y.
If you set the argument largest = TRUE, st_join() returns the x features augmented with the fields of y that have the largest overlap with each of the features of x.
See https://r-spatial.github.io/sf/reference/st_join.html and https://github.com/r-spatial/sf/issues/578 for more details.
answered Nov 16 '18 at 9:01
csteppercstepper
912
By default, st_join(x, y, join = st_intersects) duplicates all features in x,
that intersect with more than one features from y.
If you set the argument largest = TRUE, st_join() returns the x features augmented with the fields of y that have the largest overlap with each of the features of x.
See https://r-spatial.github.io/sf/reference/st_join.html and https://github.com/r-spatial/sf/issues/578 for more details.
answered Nov 16 '18 at 9:01
csteppercstepper
912
answered Nov 16 '18 at 9:01
csteppercstepper
912
answered Nov 16 '18 at 9:01
csteppercstepper
912
answered Nov 16 '18 at 9:01
csteppercstepper
912
912
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
add a comment |
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
Thank you so much! exactly what I needed to find out about.
– Pablo Herreros Cantis
Nov 16 '18 at 15:46
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53326481%2fusing-st-join-for-a-spatial-join%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
