AJR124,7,20 c. “X-coordinate" means the relative location of a point along the east–west axis of the state. Unless otherwise measured within the context of an appropriate coordinate system obtained for use as permitted by subd. 1. a., the x-coordinate shall be measured along a line drawn due east from a due north and south line running through the point which is the western extremity of this state, to the point to be located.

AJR124,8,2 d. “Y-coordinate" means the relative location of a point along the north–south axis of the state. Unless otherwise measured within the context of an appropriate coordinate system obtained for use as permitted by subd. 1. a., the y-coordinate shall be measured along a line drawn due south from a due east and west line running through the point which is the northern extremity of this state, to the point to be located.

AJR124,8,9 2. To the extent consistent with pars. (a) to (c), districts shall be compact in form. Compact districts are those which are square, rectangular, or hexagonal in shape to the extent permitted by natural or political boundaries. When it is necessary to compare the relative compactness of 2 or more districts, or of 2 or more alternative redistricting plans, the tests prescribed by subds. 3. and 4. shall be used. Should the results of these 2 tests be contradictory, the standard under subd. 3. shall be given greater weight than the standard under subd. 4.

AJR124,8,12 3. a. The compactness of a district is greatest when the length of the district and the width of the district are equal. The measure of a district's compactness is the absolute value of the difference between the length and the width of the district.

AJR124,8,17 b. In measuring the compactness of a district by means of electronic data processing, the difference between the x-coordinates of the easternmost and the westernmost geographic unit centers included in the district shall be compared to the difference between the y-coordinates of the northernmost and southernmost geographic unit centers included in the district.

AJR124,9,6 c. To determine the length and width of a district by manual measurement, the distance from the northernmost point or portion of the boundary of a district to the southernmost point or portion of the boundary of the same district and the distance from the westernmost point or portion of the boundary of the district to the easternmost point or portion of the boundary of the same district shall each be measured. If the northernmost or southernmost portion of the boundary, or each of these points, is a part of the boundary running due east and west, the line used to make the measurement required by this subd. 3. c. shall be drawn either due north and south or as nearly so as the configuration of the district permits. If the easternmost or westernmost portion of the boundary, or each of these points, is a part of the boundary running due north and south, a similar procedure shall be followed. The lines to be measured for the purpose of this subd. 3. c. shall each be drawn as required by this subd. 3. c., even if some part of either or both lines lies outside the boundaries of the district which is being tested for compactness.

AJR124,9,12 d. The absolute values computed for individual districts under this subdivision may be cumulated for all districts in a plan in order to compare the overall compactness of 2 or more alternative redistricting plans for the state or for a portion of the state. However, it is not valid to cumulate or compare absolute values computed using the measurements under subd. 3. b. with those computed using the measurements under subd. 3. c.

AJR124,9,15 4. a. The compactness of a district is greatest when the ratio of the dispersion of population about the population center of the district to the dispersion of population about the geographic center of the district is one to one.

AJR124,9,24 b. The population dispersion about the population center of a district or about the geographic center of a district is computed as the sum of the products of the population of each population data unit included in the district multiplied by the square of the distance from the geographic unit center of that population data unit to the population center or the geographic center of the district, as the case may be. The geographic center of the district is defined by averaging the locations of all geographic unit centers which are included in the district. The population center of the district is defined by computing the population–weighted average of the x-coordinates and y-coordinates of each geographic unit center assigned to the district, it being assumed for the purpose of this calculation that each population data unit possesses uniform density of population.

AJR124,10,5 c. The ratios computed for individual districts under this subdivision may be averaged for all districts in a plan in order to compare the overall compactness of 2 or more alternative redistricting plans for the state or for a portion of the state.

AJR124,10,12 (h) In preparing any redistricting plan, the legislative reference bureau shall be strictly nonpartisan. No district may be drawn for the purpose of favoring a political party, incumbent legislator or member of Congress, or other person or group or, except to the extent required under par. (a), for the purpose of augmenting or diluting the voting strength of a language or racial minority group. Except as provided in par. (j), in establishing districts, no use shall be made of any of the following data:

AJR124,10,13 1. The residence addresses of incumbent legislators or members of Congress.

AJR124,10,14 2. Political affiliations of registered voters.

AJR124,10,15 3. Previous election results.

AJR124,10,17 4. Demographic information except as necessary to meet the requirements of pars. (a) and (j).

AJR124,10,22 (i) Except as otherwise provided in this paragraph, to the extent possible, each congressional district shall contain only whole senate districts. The other standards specified in this subsection shall take precedence where a conflict arises between those standards and the requirement of including only whole senate districts within a congressional district.

AJR124,11,3 (j) In preparing any redistricting plan, the legislative reference bureau shall test the efficiency gap and competitiveness of each district and make the test results available to the public, including publishing the results on its Internet site, no later than 72 hours prior to the first public hearing on the proposed plan. The legislative reference bureau may use the data described under par. (h) 2. to 4. to perform the tests under this paragraph.

AJR124,11,4 (6) Each bill delivered under sub. (4) shall provide all of the following:

AJR124,11,6 (a) That, wherever territory is described in the bill by geographic boundaries, the following conventions are used:

AJR124,11,8 1. Each bound continues to the intersection with the bound next named, or to the intersection with a straight-line extension of such bound.

AJR124,11,10 2. If the bound is a street, it follows the center line of the street or the center line of the street extended.

AJR124,11,12 3. If the bound is a railroad right-of-way, it follows the center line of the railroad right-of-way.

AJR124,11,14 4. If the bound is a river or stream, it follows the center of the main channel of such river or stream.

AJR124,11,15 5. If the bound follows a municipal boundary, it coincides with such boundary.

AJR124,11,19 (b) That the bill first applies, with respect to regular elections, to offices filled at the next occurring general election after the bill takes effect and, with respect to special or recall elections, to offices filled or contested on or after the date of that general election.

AJR124,12,4 (7) If an action is brought challenging a legislative redistricting plan under this section on the basis of an excessive population variance among senate or assembly districts established in the plan, the legislature has the burden of justifying any variance in excess of 10 percent between the population of a senate or assembly district and the applicable ideal district population. If an action is brought challenging a congressional redistricting plan under this section on the basis of an excessive population variance among congressional districts established in the plan, the legislature has the burden of justifying any variance in excess of 1 percent between the population of a congressional district and the applicable ideal district population.

AJR124,12,5 (8) (a) In this subsection:

AJR124,12,6 1. “Chief election officer" means the elections commission administrator.

AJR124,12,7 2. “Four selecting authorities" means all of the following: