diff --git a/src/modules/zones.js b/src/modules/zones.ts
similarity index 99%
rename from src/modules/zones.js
rename to src/modules/zones.ts
index d747d395..c11ed390 100644
--- a/src/modules/zones.js
+++ b/src/modules/zones.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 import * as d3 from "d3";
 import FlatQueue from "flatqueue";
 
diff --git a/src/scripts/generation/pack/pack.ts b/src/scripts/generation/pack/pack.ts
index e400ca98..a4481759 100644
--- a/src/scripts/generation/pack/pack.ts
+++ b/src/scripts/generation/pack/pack.ts
@@ -1,14 +1,11 @@
 import * as d3 from "d3";
 
-import {markupPackFeatures} from "scripts/generation/markup";
-// @ts-expect-error js module
-import {drawScaleBar} from "modules/measurers";
-// @ts-expect-error js module
-import {addZones} from "modules/zones";
+import {UINT16_MAX} from "config/constants";
 import {DISTANCE_FIELD, MIN_LAND_HEIGHT} from "config/generation";
 import {TIME} from "config/logging";
-import {UINT16_MAX} from "config/constants";
 import {calculateVoronoi} from "scripts/generation/graph";
+import {markupPackFeatures} from "scripts/generation/markup";
+import {rankCells} from "scripts/generation/pack/rankCells";
 import {createTypedArray} from "utils/arrayUtils";
 import {pick} from "utils/functionUtils";
 import {rn} from "utils/numberUtils";
@@ -51,8 +48,18 @@ export function createPack(grid: IGrid): IPack {
     gridReference: cells.g
   });
 
-  // const rankCellsData = pick(newPack.cells, "i", "f", "fl", "conf", "r", "h", "area", "biome", "haven", "harbor");
-  // rankCells(newPack.features!, rankCellsData);
+  const {suitability, population} = rankCells(mergedFeatures, {
+    t: distanceField,
+    f: featureIds,
+    fl: riverIds,
+    conf,
+    r: riverIds,
+    h: heights,
+    area: cells.area,
+    biome,
+    haven,
+    harbor
+  });
 
   // Cultures.generate();
   // Cultures.expand();
@@ -90,10 +97,13 @@ export function createPack(grid: IGrid): IPack {
       fl: flux,
       r: riverIds,
       conf,
-      biome
+      biome,
+      s: suitability,
+      pop: population
+      // state, culture, religion, province, burg
     },
     features: mergedFeatures,
-    rivers: rawRivers
+    rivers: rawRivers // "name" | "basin" | "type"
   };
 
   return pack;
diff --git a/src/scripts/rankCells.ts b/src/scripts/generation/pack/rankCells.ts
similarity index 82%
rename from src/scripts/rankCells.ts
rename to src/scripts/generation/pack/rankCells.ts
index 39875d71..341d304a 100644
--- a/src/scripts/rankCells.ts
+++ b/src/scripts/generation/pack/rankCells.ts
@@ -1,8 +1,8 @@
 import * as d3 from "d3";
 
+import {DISTANCE_FIELD, MIN_LAND_HEIGHT} from "config/generation";
 import {TIME} from "config/logging";
 import {normalize} from "utils/numberUtils";
-import {isWater, isCoastal} from "utils/graphUtils";
 
 const FLUX_MAX_BONUS = 250;
 const SUITABILITY_FACTOR = 5;
@@ -10,18 +10,22 @@ const SUITABILITY_FACTOR = 5;
 // assess cells suitability for population and rank cells for culture centers and burgs placement
 export function rankCells(
   features: TPackFeatures,
-  cells: Pick<IPack["cells"], "i" | "f" | "fl" | "conf" | "r" | "h" | "area" | "biome" | "haven" | "harbor">
+  cells: Pick<IPack["cells"], "t" | "f" | "fl" | "conf" | "r" | "h" | "area" | "biome" | "haven" | "harbor">
 ) {
   TIME && console.time("rankCells");
 
-  const suitability = new Int16Array(cells.i.length); // cell suitability array
-  const population = new Float32Array(cells.i.length); // cell population array
+  const cellsNumber = cells.h.length;
+  const suitability = new Int16Array(cellsNumber); // cell suitability array
+  const population = new Float32Array(cellsNumber); // cell population array
 
   const meanFlux = d3.median(cells.fl.filter(f => f)) || 0;
   const maxFlux = (d3.max(cells.fl) || 0) + (d3.max(cells.conf) || 0); // to normalize flux
   const meanArea = d3.mean(cells.area) || 0; // to adjust population by cell area
 
-  for (const cellId of cells.i) {
+  const isWater = (cellId: number) => cells.h[cellId] < MIN_LAND_HEIGHT;
+  const isCoastal = (i: number) => cells.t[i] === DISTANCE_FIELD.LAND_COAST;
+
+  for (let cellId = 0; cellId < cellsNumber; cellId++) {
     if (isWater(cellId)) continue; // no population in water
 
     const habitabilityBonus = getHabitabilityBonus(cellId); // [0, 100]
@@ -40,6 +44,10 @@ export function rankCells(
     population[cellId] = total > 0 ? total * (cells.area[cellId] / meanArea) : 0;
   }
 
+  TIME && console.timeEnd("rankCells");
+
+  return {suitability, population};
+
   function getHabitabilityBonus(cellId: number) {
     return biomesData.habitability[cells.biome[cellId]];
   }
@@ -79,8 +87,4 @@ export function rankCells(
   function getEstuaryBonus(cellId: number) {
     return cells.r[cellId] && isCoastal(cellId) ? 15 : 0;
   }
-
-  TIME && console.timeEnd("rankCells");
-
-  return {s: suitability, pop: population};
 }
diff --git a/src/scripts/generation/pack/rivers.ts b/src/scripts/generation/pack/rivers.ts
index d72b6e4d..b8b6a5df 100644
--- a/src/scripts/generation/pack/rivers.ts
+++ b/src/scripts/generation/pack/rivers.ts
@@ -47,7 +47,7 @@ export function generateRivers(
 
   TIME && console.timeEnd("generateRivers");
 
-  return {heights, flux, riverIds, conf, rivers, mergedFeatures};
+  return {heights: new Uint8Array(heights), flux, riverIds, conf, rivers, mergedFeatures};
 
   function drainWater() {
     const MIN_FLUX_TO_FORM_RIVER = 30;