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geo-utils

Geographic Utilities

Documentation

API for constructing and manipulating geographic data.

Usage

 
(require-extension geopoint)

Argument Conventions
GP
geopoint.
LAT
latitude real.
LON
longitude real.

make-geopoint

[procedure] (make-geopoint LAT LON) => geopoint

geopoint?

[procedure] (geopoint? OBJ) => boolean

check-geopoint

[procedure] (check-geopoint LOC OBJ [VARNAM]) => geopoint

error-geopoint

[procedure] (error-geopoint LOC OBJ [VARNAM])

geopoint-latitude

[procedure] (geopoint-latitude GP) => real

geopoint-longitude

[procedure] (geopoint-longitude GP) => real

geopoint-strictly-above

[procedure] (geopoint-strictly-above GP1 GP2) => boolean

geopoint-above

[procedure] (geopoint-above GP1 GP2) => boolean

geopoint-strictly-below

[procedure] (geopoint-strictly-below GP1 GP2) => boolean

geopoint-below

[procedure] (geopoint-below GP1 GP2) => boolean

geopoint-strictly-left

[procedure] (geopoint-strictly-left GP1 GP2) => boolean

geopoint-left

[procedure] (geopoint-left GP1 GP2) => boolean

geopoint-strictly-right

[procedure] (geopoint-strictly-right GP1 GP2) => boolean

geopoint-right

[procedure] (geopoint-right GP1 GP2) => boolean

geopoint=

[procedure] (geopoint= GP1 GP2) => boolean

geopoint<

[procedure] (geopoint< GP1 GP2) => boolean

geopoint>

[procedure] (geopoint> GP1 GP2) => boolean

geopoint<=

[procedure] (geopoint<= GP1 GP2) => boolean

geopoint>=

[procedure] (geopoint>= GP1 GP2) => boolean

Usage

 
(require-extension geobox)

Argument Conventions
GB
geobox.

make-geobox

[procedure] (make-geobox GP-MIN GP-MAX) => geobox

geobox?

[procedure] (geobox? OBJ) => boolean

check-geobox

[procedure] (check-geobox LOC OBJ [VARNAM]) => geobox

error-geobox

[procedure] (error-geobox LOC OBJ [VARNAM])

geobox-minimum

[procedure] (geobox-minimum GB) => geopoint

geobox-maximum

[procedure] (geobox-maximum GB) => geopoint

geobox=

[procedure] (geobox= GB1 GB2) => boolean

geobox<

[procedure] (geobox< GB1 GB2) => boolean

geobox>

[procedure] (geobox> GB1 GB2) => boolean

geobox<=

[procedure] (geobox<= GB1 GB2) => boolean

geobox>=

[procedure] (geobox>= GB1 GB2) => boolean

geopoint-within-box

[procedure] (geopoint-within-box GP GB) => boolean

Usage

 
(require-extension geopolygon)

Argument Conventions
GPOLY
geopolygon.

make-geopolygon

[procedure] (make-geopolygon GP-COLL) => geopolygon

GP-COLL is list or vector of geopoint.

geopolygon?

[procedure] (geopolygon? OBJ) => boolean

check-geopolygon

[procedure] (check-geopolygon LOC OBJ [VARNAM]) => geopolygon

error-geopolygon

[procedure] (error-geopolygon LOC OBJ [VARNAM])

geopolygon

[procedure] (geopolygon GP...) => geopolygon

geopolygon-closed?

[procedure] (geopolygon-closed? GPOLY) => boolean

Polygon has the same initial and final geopoint.

geopolygon-open?

[procedure] (geopolygon-open? GPOLY) => boolean

Polygon does not have the same initial and final geopoint.

geopolygon-bounding-box

[procedure] (geopolygon-bounding-box GPOLY) => geobox

Usage

 
(require-extension geopoint-utils)

geopoint-in-closed-polygon?

[procedure] (geopoint-in-closed-polygon? GP GPOLY) => boolean

Treats an open geopolygon as closed.

Usage

 
(require-extension geo-utils)

earth-flattening

<variable>earth-flattening</variable>

earth-radius-miles

<variable>earth-radius-miles</variable>

earth-radius-kilometers

<variable>earth-radius-kilometers</variable>

pythagorean-distance

[procedure] (pythagorean-distance LAT1 LON1 LAT2 LON2) => real

pythagorean-distance*

[procedure] (pythagorean-distance* LAT1 LON1 LAT2 LON2) => real

spherical-surface-distance

[procedure] (spherical-surface-distance LAT1 LON1 LAT2 LON2 (R EARTH-RADIUS-MILES)) => real

great-circle-distance

[procedure] (great-circle-distance LAT1 LON1 LAT2 LON2 (R EARTH-RADIUS-MILES)) => real

great-circle-distance-radians

[procedure] (great-circle-distance-radians LAT1 LON1 LAT2 LON2 (R EARTH-RADIUS-MILES)) => real

approximate-ellipsoid-distance

[procedure] (approximate-ellipsoid-distance LAT1 LON1 LAT2 LON2 (R EARTH-RADIUS-MILES)) => real

great-circle-azimuth

[procedure] (great-circle-azimuth LAT1 LON1 LAT2 LON2 [PREC 5]) => real

great-circle-position

[procedure] (great-circle-position LAT LON DIS AZI (R EARTH-RADIUS-MILES)) => (values latitude longitude)

Usage

 
(require-extension geo-dms)

Argument Conventions
D
degrees real.
M
minutes real.
S
seconds real.
LAT?
latitude? boolean.
PAD
padding between elements string.

degree-minute-second-text

[procedure] (degree-minute-second-text [DMS-TEXT]) => (list-of string)

DMS-TEXT is a 3 element list of string of the form (<degrees suffix> <minutes suffix> <seconds suffix>).

dms->degree

[procedure] (dms->degree D M S) => real

degree->dms

[procedure] (degree->dms DEG) => (values D M S)

Returns the degree+minutes+seconds for the degrees DEG real.

dms->string

[procedure] (dms->string D M S [LAT? [LEADING-DIR? [PAD ""]]]) => string
LEADING-DIR?
compass direction is prefix?

Example: 122°45'10"W

dms->string*

[procedure] (dms->string* D M S [PAD ""]) => string

Example: 122°45'10"

string-dms->degree

[procedure] (string-dms->degree STR [LAT?]) => real

Returns the degrees for string form of dms STR.

Bugs & Limitations

Notes

Author

Kon Lovett

Version history
0.1.1
0.1.0
Hello

License

Copyright (C) 2017 Kon Lovett. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.