#coding: utf-8

"""Source Name: generatepointsfromlines.py

Version: ArcGIS 10.4/Pro 1.2

Author: Environmental Systems Research Institute Inc.

Description: Source for Generate Points From Line geoprocessing tool."""

importarcpyimportosfrom collections importnamedtuple

unit_conversion= dict(CENTIMETERS=0.01, DECIMETERS=0.1, FEET=0.3048,

INCHES=0.0254, KILOMETERS=1000.0, METERS=1.0,

MILES=1609.347218694438, MILLIMETERS=0.001,

NAUTICALMILES=1852.0, POINTS=0.000352777778,

UNKNOWN=1.0, YARDS=0.9144)

point_placement= dict(DISTANCE=False, PERCENTAGE=True)def create_points_from_lines(input_fc, output_fc, spatial_ref, percent=False,

dist=True, add_end_points=False):"""Convert line features to feature class of points

:param input_fc: Input line features

:param output_fc: Output point feature class

:param spatial_ref: The spatial reference of the input

:param percent: If creating points by percentage (or distance)

:param dist: The distance used to create points (if percentage == False).

The distance should be in units of the input (see convert_units)

:param add_end_points: If True, an extra point will be added from start

and end point of each line feature

:return: None"""

ifpercent:

is_percentage=Trueelse:

is_percentage=False#Create output feature class

arcpy.CreateFeatureclass_management(

os.path.dirname(output_fc),

os.path.basename(output_fc),

geometry_type="POINT",

spatial_reference=spatial_ref)#Add a field to transfer FID from input

fid_name = 'ORIG_FID'arcpy.AddField_management(output_fc, fid_name,'LONG')#Create new points based on input lines

in_fields = ['SHAPE@', 'OID@']

out_fields= ['SHAPE@', fid_name]

with arcpy.da.SearchCursor(input_fc, in_fields) as search_cursor:

with arcpy.da.InsertCursor(output_fc, out_fields) as insert_cursor:for row insearch_cursor:

line=row[0]if line: #if null geometry--skip

if line.type == 'polygon':

line=line.boundary()ifadd_end_points:

insert_cursor.insertRow([line.firstPoint, row[1]])

increment= (percent ordist)

cur_length=incrementifis_percentage:

max_position= 1.0

else:

max_position=line.lengthwhile cur_length

new_point=line.positionAlongLine(cur_length,

is_percentage)

insert_cursor.insertRow([new_point, row[1]])

cur_length+=incrementifadd_end_points:

end_point= line.positionAlongLine(1, True)

insert_cursor.insertRow([end_point, row[1]])try:

arcpy.JoinField_management(out_fc,

fid_name,

input_fc,

arcpy.Describe(input_fc).OIDFieldName)exceptarcpy.ExecuteError:#In unlikely event that JoinField fails, proceed regardless,

#as spatial and join field are already complete

pass

return

defconvert_units(dist, param_units, spatial_info):"""Base unit conversion

:param dist: Distance

:param param_units: The units as supplied from tool parameter

:param spatial_info: arcpy.SpatialReference object

:return: Distance after converted to new units"""param_units=param_units.upper()if param_units in ['', None, 'UNKNOWN']:returndistelse:if param_units != 'DECIMALDEGREES':

p_conversion=unit_conversion[param_units]else:

p_conversion= 111319.8

try:

sr_conversion=spatial_info.spatialReference.metersPerUnitexceptAttributeError:try:

input_extent=spatial_info.extent

centroid=input_extent.polygon.centroid

point1= centroid.Y, centroid.X - 0.5point2= centroid.Y, centroid.X + 0.5sr_conversion= haversine(point1, point2) * 1000

exceptException as err:#Fallback

sr_conversion = 111319.8

return dist * (p_conversion /sr_conversion)defget_distance_and_units(dist):"""Pull distance and units from a linear unit. If units are not

specified, return UNKNOWN.

:param dist: Linear units

:return: Tuple of distance (float) and units (string)"""

try:

dist, units= dist.split(' ', 1)exceptValueError:#ValueError occurs if units are not specified, use 'UNKNOWN'

units = 'UNKNOWN'dist= dist.replace(',', '.')returnfloat(dist), unitsdefhaversine(point1, point2):"""Calculate the distance between two points on the Earth surface around its curvature.

Does not account for changes in elevation (datum)

:param point1 Tuple - Tuple of (Lat, Long) for the first point

:param point2 Tuple - Tuple of (Lat, Long) for the second point

:return Float - The distance between the two points about the surface of the globe in kilometers."""

from math importradians, sin, cos, asin, sqrt

radius_of_earth_km= 6371lat1, lng1, lat2, lng2= list(map(radians, list(point1 +point2)))

d= sin((lat2 - lat1) / 2) ** 2 + cos(lat1) * cos(lat2) * sin((lng2 - lng1) / 2) ** 2

return 2 * radius_of_earth_km *asin(sqrt(d))if __name__ == '__main__':

in_features= arcpy.GetParameterAsText(0) #String

out_fc = arcpy.GetParameterAsText(1) #String

use_percent = point_placement[arcpy.GetParameter(2)] #Str -> Bool

end_points = arcpy.GetParameter(5) #Boolean

describe=arcpy.Describe(in_features)

spatial_info= namedtuple('spatial_info', 'spatialReference extent')

sp_info= spatial_info(spatialReference=describe.spatialReference,

extent=describe.extent)ifuse_percent:

percentage= arcpy.GetParameter(4) / 100 #Float

create_points_from_lines(in_features, out_fc, sp_info.spatialReference,

percent=percentage, add_end_points=end_points)else:

distance= arcpy.GetParameterAsText(3) #String

distance, param_linear_units =get_distance_and_units(distance)

distance=convert_units(distance, param_linear_units,

sp_info)

create_points_from_lines(in_features, out_fc, sp_info.spatialReference,

dist=distance, add_end_points=end_points)try:

arcpy.AddSpatialIndex_management(out_fc)exceptarcpy.ExecuteError:pass