What This Category of Data Looks Like
Residential development investment research data sources include public announcements from local housing and urban-rural development departments, project planning and design documents, construction progress ledgers, competitive project filing information, and more. Update cycles vary widely by data source type. Public land transfer and planning approval announcements are updated quarterly or monthly. Internal construction ledgers are updated weekly or monthly. Competitive project filing data is synced in real time. Document structures include structured tables and unstructured text. Core fields include floor area ratio, building density, calculable floor area, land acquisition time, construction company, and more. Units include square meters, mu, and more.
Constraints Imposed by These Characteristics on Knowledge Base Retrieval and Recall
The mixed structure of structured and unstructured documents requires the retrieval link to support both precise field matching and full-text semantic retrieval. A high share of long document files requires reasonable control of chunking granularity to avoid semantic fragmentation. Differentiated update cycles across multiple data sources require the recall link to support incremental synchronization rules configured per data source, to avoid resource waste from full synchronization. Strong project-level associated attributes require recall results to link context information of plots, projects, and competitive projects, to avoid returning isolated single entries that interfere with investment research judgments.
Configuration Settings
| Configuration Item | Recommended Value Range | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to the paragraph length of residential development project planning texts and construction ledgers, avoids semantic fragmentation |
similarityThreshold | 0.72–0.85 | Balances precise matching of plot parameters and recall coverage of full-text retrieval, avoids redundant or missed recalls |
topK | Top 8–12 entries | Residential development investment research needs to balance overall project parameters and surrounding competitive project data. Additional recalled entries can be filtered via reranking |
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Prevents parsing timeouts when processing large planning design PDFs or batch construction ledgers |
syncInterval | Tiered by data source type: public announcements weekly, internal ledgers daily | Matches update cycles of different data sources, reduces ineffective syncs |
rerankTopN | Top 3–5 entries | Focuses on core investment research conclusions, avoids non-critical information interfering with investment research judgments |
The parameter values provided on this page are common starting points for configuration. Actual values are affected by material format, data volume, and business rules. Specific issues require case-by-case analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Misconfigurations
- Symptom: A "No knowledge base selected" error is returned when calling the chat interface, or the
kbIdsfield in the interface response is empty. Cause: ThekbIdsparameter is not correctly included in the request body, or the passed knowledge base ID does not match the knowledge base ID in the deployment environment. - Symptom: Importing knowledge base content in the web link type fails, returning a parsing error. Cause: The target webpage requires login authorization, and no login bypass mechanism is configured, making it impossible to crawl public content.
- Symptom: The number of knowledge base recall results does not match the configured
topK, or project data from non-target regions appears. Cause: Structured field filtering is not enabled, or the similarity threshold is set incorrectly, resulting in recall of irrelevant project information.
How to Verify Successful Configuration
- Upload a residential development project planning PDF, check that the parsed segments match the preset chunk length, with no obvious semantic truncation.
- Initiate a retrieval request, pass the core fields of the target plot, check that the recall results include matching structured data and relevant unstructured documents.
- View the knowledge base sync logs, confirm that sync tasks for different data sources execute at preset intervals, with no duplicate or missing sync records.
- Call the chat interface with the correct knowledge base ID parameter, check that the returned results only include content from the specified knowledge base, with no irrelevant data from cross-knowledge base sources.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.