Kuwait Cadastral & GIS Architecture Specification

Status: Authoritative Specification (Post-Migration 20260926180000)
Platform Scope: Kuwait Baladia GIS, PACI Kuwait Finder, and Triple Cadastral Identity Verification

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1. Executive Summary & Triple Cadastral Identity

Aldilaijan & Khobara anchors all property, valuation, and transaction records to a unified Triple Cadastral Identity:

graph TD
    P["Property Listing / Valuation Request"] --> PACI["PACI Civil ID (الرقم الآلي للعنوان)<br>8-digit PACI Finder Identifier"]
    P --> BAL["Baladia GISNo (الرقم العقاري)<br>Authoritative Municipal Parcel Key"]
    P --> MOJ["MOJ Title Deed (رقم الوثيقة)<br>Ministry of Justice Real Estate Registration"]
    
    PACI --- BAL
    BAL --- MOJ
    MOJ --- PACI

1. PACI Civil ID (al_raqam_al_ali): 8-digit civil number issued by the Public Authority for Civil Information (PACI). Connects the building entrance and street address to national spatial directories.
2. Baladia GISNo (parcel_identity_id / GISNo): Authoritative 12-digit municipal parcel identifier assigned by Kuwait Municipality (Baladia). Joins directly to municipal building licenses (الرخص الإنشائية) and zoning envelopes.
3. Ministry of Justice Title Deed (deed_number): Statutory registration number issued by the Real Estate Registration and Authentication Department (التسجيل العقاري والتوثيق).

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2. Parcel Resolution Pipeline

When a property is ingested or updated, the database triggers the automated cadastral resolution function: internal.resolve_parcel_identity(p_area_key, p_block_no, p_plot_no, p_area_sqm)

flowchart TD
    A["Raw Intake: (Area, Block, Plot, Area m²)"] --> L1{"Level 1:<br>Verbatim Exact Match?"}
    L1 -- Yes --> R1["Matched Exact Parcel Polygon<br>(Match Confidence: 100%)"]
    L1 -- No --> L2{"Level 2:<br>Arabic Orthographic / Hamza Match?"}
    L2 -- Yes --> R2["Matched Orthographic Fold<br>(Match Confidence: 99%)"]
    L2 -- No --> L3{"Level 3:<br>Letter-Suffix Parent Plot Match?"}
    L3 -- Yes --> R3["Matched Subdivided Parent Parcel<br>(Flag: is_subdivisible = true)"]
    L3 -- No --> L4{"Level 4:<br>Centroid Spatial Proximity Match?"}
    L4 -- Yes --> R4["Nearest Centroid Match<br>(Flag: spatial_fallback)"]
    L4 -- No --> R5["Unmatched / Manual Survey Required"]

Hierarchy of Match Rules:

1. Level 1 (Verbatim Exact): Exact string equality on (area_key, block_no, parcel_no).
2. Level 2 (Orthographic / Hamza Normalization):
   • Normalizes Arabic Alif variants: أ (\u0623), إ (\u0625), آ (\u0622) $\rightarrow$ ا (\u0627).
   • Normalizes Yeh variants: ى (\u0649) $\rightarrow$ ي (\u064A).
   • Normalizes Teh Marbuta: ة (\u0629) $\rightarrow$ ه (\u0647).
   • Removes zero-width joiners, non-breaking spaces, and Arabic tatweel (ـ).
3. Level 3 (Subdivided Parent Match): Strips trailing letter suffixes (ا, ب, ج, د, ك, غ, ر) and joins against the registered numeric master parcel.
4. Level 4 (Spatial Centroid): Resolves against closest cadastral parcel within 50 meters in the same block, provided area variance is $< 10%$.

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3. Letter-Suffixed Plot Classifications (The 4 Real-World Categories)

Brokerage listings in Kuwait frequently contain letter suffixes on plot numbers (al_qusayma). A comprehensive live audit of the database identified four distinct real-world domain categories:

Category A: Orthographic / Hamza Normalization (100% Exact Polygon)

• Domain Context: Broker listings transcribe Arabic plots using bare Alif (ا), whereas Baladia GIS surveyors enter the legal Hamza (أ).
• Audit Findings:
  • AK-1019 (Surra Block 4): Listing 108ا $\rightarrow$ Baladia 108أ ($1,000.0\text{ m}^2$).
  • AK-1125 (Surra Block 6): Listing 176ا $\rightarrow$ Baladia 176أ ($600.0\text{ m}^2$).
  • AK-123 (Surra Block 2): Listing 137ا $\rightarrow$ Baladia 137أ ($750.0\text{ m}^2$).
  • AK-125 (Daiya Block 3): Listing 33ا $\rightarrow$ Baladia 33أ ($488.0\text{ m}^2$).
  • AK-4617 (Daiya Block 3): Listing 20ك $\rightarrow$ Baladia 20ك ($400.0\text{ m}^2$, GISNo 111200021570).
• Resolution: Handled with 100% exact polygon alignment. Polygon boundary and area match identically.

Category B: South Surra Subdivisions (Zahra & Hitteen Half-Plots)

• Domain Context: Residential blocks in South Surra (Zahra, Hitteen, Shuhada, Salam, Siddeeq) were initially surveyed as $750\text{ m}^2 - 800\text{ m}^2$ master plots. Owners lawfully partitioned these into dual $375\text{ m}^2 - 400\text{ m}^2$ parcels with independent street entrances.
• Cadastral Reality: Baladia GIS retains either the whole master parcel number or registers hyphenated identifiers (e.g. 1-193, 1-264).
• Audit Findings:
  • AK-113 (Zahra Block 8, Plot 227ا, $400\text{ m}^2$): Baladia retains parent parcel 227 ($400.0\text{ m}^2$).
  • AK-1815 (Zahra Block 8, Plot 264ا, $400\text{ m}^2$): Baladia retains parent parcel 264 ($400.1\text{ m}^2$).
  • AK-796 (Zahra Block 8, Plot 153ب, $375\text{ m}^2$): Baladia retains parent parcel 153 ($401.5\text{ m}^2$).
  • AK-906 (Hitteen Block 4, Plot 203ا, $375\text{ m}^2$): Baladia retains parent parcel 203 ($375.0\text{ m}^2$).
  • AK-1247 (Zahra Block 5, Plot 683ا, $406\text{ m}^2$): Baladia retains parent parcel 683 ($406.9\text{ m}^2$).
• Platform Behavior: Correctly linked to the master cadastral parcel. Flagged as is_subdivisible = true with CAD_SUBDIVIDED_PARENT_MATCH so app UI displays the parent envelope while acknowledging the subdivided tenure.

Category C: Agricultural Compounds & Livestock Enclosures (Abdali & Kabd)

• Domain Context: Vast agricultural concessions ($50,000\text{ m}^2$) in Abdali and Wafra, and livestock tenures ($1,250\text{ m}^2 - 2,500\text{ m}^2$) in Kabd. Brokers assign letter suffixes to distinguish internal family compounds, gate numbers, or leasehold partitions.
• Cadastral Reality: Kuwait Municipality and PAAF (الهيئة العامة لشؤون الزراعة والثروة السمكية) register only whole numeric titles.
• Audit Findings:
  • AK-1201 (Abdali Block 5, Plot 34ر, $50,000\text{ m}^2$): Baladia parcel 34 ($58,534.5\text{ m}^2$).
  • AK-1255 (Abdali Block 5, Plot 33ر, $50,000\text{ m}^2$): Baladia parcel 33 ($49,999.6\text{ m}^2$).
  • AK-1465 (Abdali Block 4, Plot 14ا, $50,000\text{ m}^2$): Baladia parcel 14 ($49,999.5\text{ m}^2$).
  • AK-872 (Abdali Block 3, Plot 15ج, $50,000\text{ m}^2$): Baladia parcel 15 ($92,067.2\text{ m}^2$).
  • AK-627 (Kabd Block 10, Plot 218ا, $1,250\text{ m}^2$): Baladia parcel 21 ($2,500.0\text{ m}^2$).
• Platform Behavior: Linked to the agricultural master parcel with land use code Subtype 4: Agricultural.

Category D: Coastal Usufruct Chalets (Zour, Julaia, Bnaider)

• Domain Context: Coastal resort properties along Nuwaiseeb, Zour, and Julaia coastlines.
• Cadastral Reality: Held under Ministry of Finance (MoF) State-Domain Usufruct Contracts (أملاك الدولة), not standard freehold municipal deeds. Baladia GIS does not issue standard private residential building licenses for these plots.
• Audit Findings:
  • AK-1163 (Zour Chalets Block 1, Plot 33ا22, $2,322\text{ m}^2$): MoF Usufruct plot.
  • AK-1311 (Zour Chalets Block 1, Plot 33ا34, $3,189\text{ m}^2$): MoF Usufruct plot.
  • AK-4308 (Julaia Chalets Block 1, Plot 48ل, $45,329\text{ m}^2$): Master resort compound.
  • AK-682 (Julaia Chalets Block 1, Plot 48م, $45,329\text{ m}^2$): Master resort compound.
• Platform Behavior: Processed via specialized chalet composition schema (sea_frontage_meters, mof_transfer_fee_kwd, chalet_coastal_row) rather than municipal FAR tables.

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4. UI & Brokerage Ingestion Best Practices

1. Intake Auto-Correction: When an agent pastes or types a plot number with letters, the system searches verbatim first, orthographic second, and parent third.
2. Badge Attribution:
   • Exact Cadastral Match: Green badge with Baladia GISNo and verified area.
   • Subdivided Parent Lot: Amber badge (قسيمة فرعية - مطابقة للمخطط الأم) noting that building envelopes derive from the master parcel.
   • MoF Usufruct Concession: Blue badge (عقد أملاك دولة - شاليهات) with coastal frontage meters.
3. No Artificial Polygon Fabrication: The system never synthesizes false boundaries. Where Baladia has not published an official sub-parcel polygon, the app displays the parent parcel boundaries with explicit subdivision metadata.