1. Soil Survey and Mapping Scale Intensity of Mapping Map Scale

2. Intensity of Mapping: Level of detail and field inspection density that is required to achieve it. Map Scale: Only the scale of publication

3. Purity/Precision of Soil Map Keep in mind: Number of field inspections increase with detail of survey. The larger the final intended map scale, the higher the intensity of field observation per cm 2 of map

4. Purity/Precision of Soil Map Remember: Increased precision may not improve the reliability of the map. Inspection per cm 2 is not a direct reflection of accuracy.

5. Acceptable Number of Observation Survey Intensity Level (SIL): Acceptable inspection intensity varies between 0.2 to 2 inspections per cm 2, depending on homogeneity of the soil. Reliability of Soil Boundary: Intensity provide an estimate of the reliability of identified soil parameters in delineation, not necessarily the soil boundary placement.

6. Types of Field Studies Synthesis (< 1: 1,000,000) Exploratory/Low intensity (1:100,000 to 1:1,000,000) Reconnaissance/Medium intensity (1:25,000 to 1:100,000) Semi-detailed/High intensity (1:10,000 t0 1:25,000) Detailed/Very high intensity (<1:10,000)

7. Soil Intensity Level (SIL) Nearest FAO Equivalent Aim and LevelSite Intensity and Survey Method Synthesis <1:1,000,000 Resource inventoryFree survey of variable intensity, <1:1000 ha ExploratoryExploratory to low intensity 1:1,000,000 to 1:100,000 Resource inventory Project location Regional Planning Free survey of variable intensity, usually much < 1 per 100 ha ReconnaissanceMedium intensity 1:100,000 to 1:25,000 Pre-feasibility Project Location Regional Planning Free survey of variable intensity, usually < 1 per 100 ha Semi-detailedHigh intensity 1:25,000 to 1:20,000 Pre-feasibility Feasibility Development Planning Flexible or rigid grid, Intensity 1 per 15 to 50 ha DetailedVery high intensity > 1:10,000 Development Management Special purpose Research plots Rigid grid 1 per 1 to 25 ha

8. Soil Intensity Level (SIL) Minimum Size of Delineation (ha) Mapping progress rate (Km 2 /month) Density of observation (observ./km 2 ) Synthesis< 5,000ha>200< 0.05 Exploratory50 to 5,000>2000.05 to 0.5 Reconnaissance6.25 to 5015 to 2000.5 to 8 Semi-detailed4 to 6.2512 to 158 to 12.5 Detailed0.25 to 1<1250 to 200

9. Soil Intensity Level (SIL) Associated FeaturesPreferred Scales Represented Soil Component Map Units 5 Aerial PhotosFinal Maps SynthesisGreat soil groups, phases of great groups Physiographic units/land systems < 1:100,000Variable ExploratoryAssociation of great groups or subgroups, land units of various kind Mainly compound, potential development areas 1:50,000 to 1:100,000 Variable ReconnaissanceAssociations of soil series, physiographic units Compound and some simple units !:50,000 to 1:20,000 < 1:50,000 Semi-detailedSoil series, soil complexes and associations of soil series Simple and compound units 1:25,000 to 1:10,000 1:20,000 to 1:10,000 DetailedPhases of soil series, soil series, land parameters Mainly simple units 1:10,000 to 1:5,000 1:10,000 to 1:5,000